Subzero 400-2 series User manual

Troubleshooting Guide 105

subzero.com 800.222.7820

400

Service Manual

Page 2

TroubleShoot Guide Wine Storage

Wine Storage (400-

(400-2

)Series

Series

7-2

#3758410 - Revision C - May, 2014

TROUBLESHOOTING GUIDES

This section of the manual contains:

• Temperature Problem Diagnostic Worksheets (does not apply to 427R-2 refrigerator section)

• Error Code Tables and the Error Code Troubleshooting Guides

• General Troubleshooting Guide (Wine storage and 427R-2 Refrigerator Section)

• Sealed System Diagnostic Tables

• Membrane Switch/Ribbon Cable Test Procedures

Temperature Problem Diagnostic Worksheet (does not apply to 427R-2 refrigerator section)

The Diagnostic Worksheets on the following three pages are designed to help identify the cause of temperature

problems in a wine storage unit. To fill out the worksheet, familiarity with Diagnostic Mode and Temperature Log

Recall Mode is required (See section 3 of this manual).

NOTE: Diagnostic Worksheet do not apply to temperature problems in the refrigerator section of a 427R-2.

Follow the steps below and fill out a diagnostic worksheet before referencing the General Troubleshooting Guide.

1. Write down temperatures shown on display.

a. If unit is OFF, switch unit ON and go to step #2 below.

b. If unit will not run, but display is functioning, go to step #3 below.

NOTE: “EE” displayed in place of either compartment temperature indicates a compartment thermistor

error. Thermistor errors cause power to the compressor and fans to be cut.

c. If unit will not run and display will not operate, go directly to General Troubleshooting Guide.

2. Write down the set-points, keeping in mind that the initial key stroke will change the true set-point by a one

degree increment or decrement, depending on choice of WARMER, or COLDER key, respectively.

3. Initiate Diagnostic Mode by pressing and holding either

COLDER key and the UNIT ON/OFF key, then write down

any Error codes that may appear and the temperature

readings for each thermistor location. (See Thermistor

Location Code Table at right.)

a. If error codes appear, go directly to Error Code

Troubleshooting Guide.

b. If “EE” is displayed in place of temperature, this indi-

cates a thermistor error in that location.

4. Initiate Temperature Log Recall Mode by pressing and holding the desired compartment WARMER key and

the UNIT ON/OFF key, then toggle through the indexes, writing down the temperature of each index for both

compartments. If the “BELL ON” or “SERVICE” indicators light up during an index, circle it on the work-

sheet.

a. By observing the temperatures logged, it will be possible to see if any warming or cooling trends

occurred, whether this trend was in one or both compartments, and if there was a power interruption

(“BELL ON” illuminate), or that the unit was switched OFF (“SERVICE” illuminates).

b. If double dashes ( - - ) are displayed, the control board is defective.

NOTE: To see the index/time correlation, refer to the Temperature Log Index Chart on last page of sec-

tion 3 of this manual.

5. Use the information gathered on the worksheet in conjunction with the General Troubleshooting Guide.

Wine Storage Thermistor Location Codes

THERMISTOR LOCATION CODE

Upper Evaporator UE

Lower Evaporator LE

Upper Compartment UP

Lower Compartment LO

MODELS 424-2, 427-2, 427R-2, 430-2

Page 3

Wine Storage

Wine Storage (400-

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)Series

Series TroubleShoot Guide

7-3 #3758410 - Revision C - May, 2014

Logged Temp.

UpperLower

TEMPERATURE PROBLEM DIAGNOSTIC WORKSHEET

Temperature Displayed: Lower _________ Upper _________

Set-Point: Lower _________ Upper _________

Diagnostic Mode Thermistor Readings: EC (Error Codes) _______________________________________

UE (Upper Evap) ________LE (Lower Evap) ________UP (Upper Cmprt) ________LO (Lower Cmprt)________

Index

BELL ON / SERVICE

Indicator Lit

(Circle below if present)

Logged Temp.

UpperLower

Index

BELL ON / SERVICE

Indicator Lit

(Circle below if present)

Page 4

TroubleShoot Guide Wine Storage

Wine Storage (400-

(400-2

)Series

Series

7-4

#3758410 - Revision C - May, 2014

Logged Temp.

UpperLower

TEMPERATURE PROBLEM DIAGNOSTIC WORKSHEET

Temperature Displayed: Lower _________ Upper _________

Set-Point: Lower _________ Upper _________

Diagnostic Mode Thermistor Readings: EC (Error Codes) _______________________________________

UE (Upper Evap) ________LE (Lower Evap) ________UP (Upper Cmprt) ________LO (Lower Cmprt)________

Index

BELL ON / SERVICE

Indicator Lit

(Circle below if present)

Logged Temp.

UpperLower

Index

BELL ON / SERVICE

Indicator Lit

(Circle below if present)

Page 5

Wine Storage

Wine Storage (400-

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)Series

Series TroubleShoot Guide

7-5 #3758410 - Revision C - May, 2014

Logged Temp.

UpperLower

TEMPERATURE PROBLEM DIAGNOSTIC WORKSHEET

Temperature Displayed: Lower _________ Upper _________

Set-Point: Lower _________ Upper _________

Diagnostic Mode Thermistor Readings: EC (Error Codes) _______________________________________

UE (Upper Evap) ________LE (Lower Evap) ________UP (Upper Cmprt) ________LO (Lower Cmprt)________

Index

BELL ON / SERVICE

Indicator Lit

(Circle below if present)

Logged Temp.

UpperLower

Index

BELL ON / SERVICE

Indicator Lit

(Circle below if present)

Page 6

TroubleShoot Guide Wine Storage

Wine Storage (400-

(400-2

)Series

Series

7-6

#3758410 - Revision C - May, 2014

Wine Storage Error Code Troubleshooting Guide Instructions

Error Codes indicate problems registered by specific components. If error codes are registered, they will appear

before temperature readings while in Diagnostic Mode.

1. Initiate Diagnostic Mode by pressing and holding either COLDER key, and press the UNIT ON/OFF key, then

release both keys.

2. Check for Error Codes on the display, making sure to toggle through all possible readings by pressing either

COLDER key or either WARMER key. (See Error Code Table Below)

3. If Error Codes appear are displayed, follow the Error Code Troubleshooting Guide on next page.

a. The left column of the Error Code Troubleshooting Guide lists the error codes.

b. The right column of the Error Code Troubleshooting Guide explains what tests and/or corrective actions to

perform.

NOTE: If error codes are observed, the SERVICE indicator will appear constant when Diagnostic Mode ends, indi-

cating error codes are logged. To clear this and the error codes from the software memory, the problem must be

corrected and the unit must be ON. Then, press and hold the bell key for fifteen (15) seconds. The control will emit

a short “beep” when the SERVICE indicator and error codes are cleared.

WINE STORAGE ERROR CODE TABLE

CODE INDICATION

05 Upper Cabinet Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s

06 Upper Evaporator Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s

07 Lower Cabinet Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s

08 Lower Evaporator Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s

10 Upper Cabinet Warm Temperature alarm

11 Upper Cabinet Cold Temperature alarm

12 Lower Cabinet Warm Temperature alarm

13 Lower Cabinet Cold Temperature alarm

15 Sealed System Fault (evap temperature cannot drop 5° in 5 minutes, 3 consecutive valve activations)

Wine Storage Thermistor Location Codes

THERMISTOR LOCATION CODE

Upper Evaporator UE

Lower Evaporator LE

Upper Compartment UP

Lower Compartment LO

MODELS 424-2, 427-2, 427R-2, 430-2

Page 7

Wine Storage

Wine Storage (400-

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Series TroubleShoot Guide

7-7 #3758410 - Revision C - May, 2014

Error Code Test / Action

10 or 12

11 or 13

a. Check upper compartment thermistor electrical connections and continuity from thermistor to J2 on control

board. Reconnect / repair connections.

b. Check resistance of upper compartment thermistor for 30,000 to 33,000 ohms at 32°F/ 0°C. Replace if

defective.

a. Check upper compartment evaporator thermistor electrical connections and continuity from thermistor to

J2 on control board. Reconnect / repair connections.

b. Check resistance of upper compartment evaporator thermistor for 30,000 to 33,000 ohms at 32°F / 0°C.

Replace if defective.

a. Check lower compartment thermistor electrical connections and continuity from thermistor to J2 on control

board. Reconnect / repair connections.

b. Check resistance of lower compartment thermistor for 30,000 to 33,000 ohms at 32°F/ 0°C. Replace if

defective.

a. Check lower compartment evaporator thermistor electrical connections and continuity from thermistor to J2

on control board. Reconnect / repair connections.

b. Check resistance of lower compartment evaporator thermistor for 30,000 to 33,000 ohms at 32°F / 0°C.

Replace if defective.

a. Check room ambient temperature. Unit performs best between 60°F / 16°C - 90°F / 32°C

b. Check for door obstructions, door seal and door adjustment issues; Remove obstruction, align door.

c. Check switch depressor; Reposition or replace.

d. Check cleanliness of condenser; Clean condenser.

e. Check for obstructions at appropriate compartment fan blade; Remove obstruction.

f. Check appropriate compartment evaporator fan blade spacing. Adjust if needed.

g. Check appropriate fan motor and fan switch connections; Repair or replace.

h. Check resistance of appropriate compartment thermistor for 30,000 to 33,000 ohms at 32°F/ 0°C. Replace

if defective.

i. Initiate manual valve activation mode for appropriate compartment:

1. Check for proper voltage from J3 on board to appropriate evaporator fan motor. Replace or repair

defective components.

2. If opposite evaporator temperature drops, check for proper wiring at valve; repair wire connections. If

wiring is correct, replace valve assembly.

j. Check AMP draw of compressor. If high by 15% or more, replace compressor.

k. Check sealed system for leaks; Repair replace defective parts.

a. Check room ambient temperature. Unit performs best between 60°F / 16°C - 90°F / 32°C

b. Check for door obstructions, door seal and door adjustment issues; Remove obstruction, align door.

c. Check appropriate compartment thermistor electrical connections and continuity from thermistor to J2 on

control board. Reconnect / repair connections.

d. Check resistance of appropriate compartment thermistor for 30,000 to 33,000 ohms at 32°F/ 0°C. Replace

if defective.

a. Initiate manual valve activation mode for upper compartment:

1. Check for proper voltage from J3 on board to appropriate evaporator fan motor. Replace or repair

defective components.

2. If lower evaporator temperature drops, check for proper wiring at valve; repair wire connections. If

wiring is correct, replace valve assembly.

b. Initiate manual valve activation mode for lower compartment:

1. Check for proper voltage from J3 on board to appropriate evaporator fan motor. Replace or repair

defective components.

2. If upper evaporator temperature drops, check for proper wiring at valve; repair wire connections. If

wiring is correct, replace valve assembly.

c. Check AMP draw of compressor. If high by 15% or more, replace compressor.

d. Check sealed system for leaks, or restrictions; Repair replace defective parts.

WINE STORAGE ERROR CODE TROUBLESHOOTING GUIDE

NOTE: After repairs, always clear Error Codes by pressing Bell ON/OFF key for 15 seconds.

Page 8

TroubleShoot Guide Wine Storage

Wine Storage (400-

(400-2

)Series

Series

7-8

#3758410 - Revision C - May, 2014

Model 427R-2 Refrigerator Error Code Troubleshooting Guide Instructions

Error Codes indicate problems registered by specific components. If error codes are registered, they will appear

before temperature readings while in Diagnostic Mode.

1. Initiate Diagnostic Mode by pressing and holding the COLDER key, and press the UNIT ON/OFF key, then

release both keys.

2. Check for Error Codes on the display, making sure to toggle through all possible readings by pressing the

COLDER key or WARMER key. (See Error Code Table Below)

3. If Error Codes appear are displayed, follow the Error Code Troubleshooting Guide on next page.

a. The left column of the Error Code Troubleshooting Guide lists the error codes.

b. The right column of the Error Code Troubleshooting Guide explains what tests and/or corrective actions to

perform.

NOTE: If error codes are observed, the SERVICE indicator will appear constant when Diagnostic Mode ends, indi-

cating error codes are logged. To clear this and the error codes from the software memory, the problem must be

corrected and the unit must be ON. Then, press and hold the bell key for fifteen (15) seconds. The control will emit

a short “beep” when the SERVICE indicator and error codes are cleared.

NOTE: If Error Codes appear with a flashing “SERVICE” annunciator prior to initiating Diagnostic Mode, the unit

experienced excessive compressor run condition that may or may not be associated with the Error Codes displayed.

427R-2 REFRIGERATOR COMPARTMENT ERROR CODE TABLE

CODE INDICATION

05 Refrig. cabinet thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s

06 Refrig. evaporator thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s

50 Excessive Refrigerator Compressor Run

Refrigerator Thermistor Location Codes

THERMISTOR LOCATION CODE

Refrigerator Compartment

Refrigerator Evaporator

MODEL 427R-2 Only

Page 9

Wine Storage

Wine Storage (400-

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)Series

Series TroubleShoot Guide

7-9 #3758410 - Revision C - May, 2014

EC TEST / ACTION

A. If “EE” for refrigerator compartment was displayed and “SERVICE” flashing, check the following:

1. Thermistor electrical connections and continuity from thermistor to control board. Reconnect / repair.

2. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F. Replace if defective.

B. If “EE” for refrigerator compartment was NOT displayed, problem is intermittent thermistor error:

1. Door not closing properly. Correct door closing problem.

2. Fan switch, light switch, wiring & electrical connections. Repair wiring / connections or replace switch.

3. Thermistor electrical connections and continuity from thermistor to control board. Reconnect / repair.

4. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F. Replace if defective.

C. If “EC 05” and “SERVICE” were flashing before initiating diagnostic mode, unit also experienced excessive com-

pressor run condition that may or may not be associated with the “05” Error Code. See Error Code 50 below.

A. Initiate Diagnostic Mode. If “EE” is displayed for refrigerator evaporator thermistor, check the following:

1. Thermistor electrical connections and continuity from thermistor to control board. Reconnect / repair.

2. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F. Replace if defective.

B. Initiate Diagnostic Mode. If “EE” is NOT displayed for refrigerator evaporator thermistor, problem is intermittent:

1. Door not closing properly. Correct door closing problem.

2. Fan switch, light switch, wiring & electrical connections. Repair wiring / connections or replace switch.

3. Thermistor electrical connections and continuity from thermistor to control board. Reconnect / repair.

4. Resistance of thermistor - 30,000 to 33,000 ohms at 32°F. Replace if defective.

C. If “EC 06” and “SERVICE” were flashing before initiating diagnostic mode, unit also experienced excessive com-

pressor run condition that may or may not be associated with the “06” Error Code. See Error Code 50 below.

A. Check for obstructions to refrigerator drawer closing, including drawer closer position. Remove obstruction/Trip

drawer closer forward.

B. Check resistance of refrigerator compartment thermistor - 30,000 to 33,000 ohms at 32°F. Replace if defective.

C. Check refrigerator compartment fan blade position and for obstructions. Reposition if incorrect/Remove obstruction.

D. With unit running and light switches depressed:

1. Check for 115 V AC form control board to evaporator fan motor. Repair wiring/Replace defective motor.

E. Check sealed system for leaks, restrictions or inefficient compressor.

427R-2 REFRIGERATOR COMPARTMENT ERROR CODE TROUBLESHOOTING GUIDE

NOTE: After repairs, always clear Error Codes by pressing Bell ON/OFF key for 15 seconds.

Page 10

TroubleShoot Guide Wine Storage

Wine Storage (400-

(400-2

)Series

Series

7-10

#3758410 - Revision C - May, 2014

General Troubleshooting Guide

The Table of Contents below indicates how the General Trouble Shooting Guide is arranged.

1. As close as possible, match the complaint, or description of the problem the unit is experiencing with those in

the table of contents below.

2. To the left of the problem description below, take note of the letter.

3. Locate that letter in the left column of the General Troubleshooting Guide.

a. In the center column of the General Troubleshooting Guide is a list of possible causes for the problem.

b. The information in the right column explains explains what tests and/or corrective actions to perform.

NOTE: If the complaint, or problem is warm temperatures, or temperatures too cold, in a wine storage compart-

ment, be sure to complete a Temperature Problem Diagnostic Worksheet on the preceding pages before continuing.

NOTE: All key strokes necessary to help in diagnosing a problem are explained in section 3 of this manual.

Wine Storage Troubleshooting Guide Table of Contents

Ltr Problem Description Page #

A. "SERVICE" Flashing ........................................................................................................................................................... 7-11

B. Warm Temperature in Both Wine Storage Compartments .................................................................................................. 7-11

C. Warm Temperature in Only One Wine Storage Compartment ........................................................................................... 7-12

D. Actual vs. Displayed Temperature Over 10° Different ....................................................................................................... 7-13

E. Actual vs. Displayed Temperature Less Than 10° Different .............................................................................................. 7-13

F. Excessively Cold Temperatures in Both Wine Storage compartments .............................................................................. 7-13

G. Excessively Cold Temperatures in Only One Wine Storage compartment ........................................................................ 7-13

H. Lights Stay ON ................................................................................................................................................................... 7-13

I. No Lights ............................................................................................................................................................................ 7-13

J. Control Panel Keys Malfunctioning .................................................................................................................................... 7-14

K. No LED's ............................................................................................................................................................................ 7-14

L. All LED's Lit ........................................................................................................................................................................ 7-14

M. Same LED Segments Missing from Both Display Windows .............................................................................................. 7-14

N. LED Segments Missing from Only One Display Window ................................................................................................... 7-14

O. Door / Unit Un-level ............................................................................................................................................................ 7-14

427R-2 Refrigerator Section Troubleshooting Guide Table of Contents

Ltr Problem Description Page #

P. “ EE” Displayed in place of Refrigerator Temperature with “SERVICE” Flashing ............................................................... 7-15

Q. Warm or Normal Temperatures Displayed with “SERVICE” Alone Flashing ...................................................................... 7-15

R. Warm or Normal Temperatures Displayed with non-flashing “SERVICE” Displayed ......................................................... 7-15

S. Erratic Temperatures with or without “SERVICE” Flashing ................................................................................................ 7-15

T. Warm Refrigerator Temperatures, “SERVICE” not displayed or Flashing ......................................................................... 7-15

U. Product Temperature 10° or More Colder than Displayed Temperature ........................................................................... 7-16

V. 1. “Extremely” Cold Temperatures Displayed (1° to 7° in Refrigerator) ............................................................................ 7-16

2. If outside US - “Extremely” Warm Temperatures Displayed (34° to 45° in Refrigerator)

W. No LCD .............................................................................................................................................................................. 7-16

X. No Lights ........................................................................................................................................................................... 7-17

Y. Lights Stay ON when Drawers Closed - (May be Accompanied by Drawer Ajar Alarm Bell) ........................ 7-17

Z. Drawers Not Able to Close Completely .......................................................................................................... 7-17

AA. Drawers Uneven ............................................................................................................................................ 7-17

Sealed System Diagnostic Tables .................................................................................................................................................7-18

Wine Storage Membrane Switch Ribbon Cable Test ................................................................................................................... 7-19

Model 427R Refrigerator Membrane Switch Ribbon Cable Test ................................................................................................. 7-20

Page 11

A. “SERVICE” FLASHING

B. WARM TEMPERATURE IN

BOTH WINE STORAGE

COMPARTMENTS

See Error Code Troubleshooting Guide

Control Set Too Warm

Unit in Showroom Mode

Unit Recently Energized

Unit Recently Stocked with Wine

High Room Ambient

Door Ajar

a. Wine Rack Obstruction

b. Door out of Adjustment

c. Door or Cabinet Hinge Problem

Condenser Air Flow / Fan Fault

a. Dirty Condenser

b. Fan Blade Loose or Obstructed

c. Fan Motor Disconnected or

Malfunctioning

Evaporator Fan Circuit Fault

a. Fan Switch(es) Disconnected or

Malfunctioning

b. No Power from Control Board

No Power from Control Board to

Compressor

Compressor Fault

a. Compressor Electricals Disconnected

or Malfunctioning

b. Compressor Inefficient, or Locked

Sealed System Leak or Restriction

See Error Code Troubleshooting Guide

Check set-points. Adjust set-points COLDER

Adjust set-points colder, listen for compressor

& condenser fan operation. If they do not run,

switch unit OFF, then press and hold upper

COLDER & WARMER keys while pressing

UNIT ON/OFF key.

Allow time for unit to pull down

Instruct customer

Instruct Customer that unit performs best

between 60°F / 16°C - 90°F / 32°C

a. Adjust wine rack

b. See Door Adjustment procedure in section

2 of this manual.

c. Check hinges. Replace if defective.

a. Check/clean condenser.

b. Tighten blade or move obstruction.

c. Check fan motor operation. Check fan

motor electrical connections back to com-

pressor. Check for 115V AC from fan

motor to compressor. Reconnect or repair

wires, or replace motor if defective.

a. Check fan switch electrical connections.

Check for 115V AC to and from switch.

Reconnect or replace switch if defective.

b. Check for 115V AC at J3 on control board.

(NOTE: Unit must be running and not in

Showroom Mode) If no power, replace

board.

Initiate Manual Valve Activation Mode, check

for 115V AC at E2 on the control board. If no

power, replace board.

a. Check integrity of compressor electricals.

Check continuity back to control board.

Check for 115V AC at E2 on control board.

Correct wiring problems or replace com-

pressor electricals if defective. If no power

between at E2 , replace control board.

b. Check AMP draw on compressor. If high

by 15% or more, replace compressor.

SEE SEALED SYSTEM DIAGNOSTIC

INFORMATION

PROBLEM POSSIBLE CAUSE TEST / ACTION

Wine Storage

Wine Storage (400-

(400-2

)Series

Series TroubleShoot Guide

7-11 #3758410 - Revision C - May, 2014

Page 12

PROBLEM POSSIBLE CAUSE TEST / ACTION

TroubleShoot Guide Wine Storage

Wine Storage (400-

(400-2

)Series

Series

7-12

#3758410 - Revision C - May, 2014

C. WARM TEMPERATURE IN

ONLY ONE WINE STORAGE

COMPARTMENT

Control Set Too Warm

Unit Recently Energized

Unit Recently Stocked with Wine

High Room Ambient

Door Ajar

a. Wine Rack Obstruction

b. Door out of Adjustment

c. Door or Cabinet Hinge Problem

Thermistor Fault

a. Evaporator Thermistor Location

b. Evaporator Thermistor Wiring /

Connections problem

c. Evaporator or Compartment

Thermistor Misread

Condenser Air Flow / Fan Fault

a. Dirty Condenser

b. Fan Blade Loose, or Obstructed

c. Fan Motor Disconnected or

Malfunctioning

Evaporator Fan / Fan Circuit Fault

a. Fan Blade out of Position or

Obstructed

c. Fan Switch Disconnected or

Malfunctioning

b. Fan Motor Disconnected or

Malfunctioning

d. No Power from Control Board

Refrigerant Valve Fault

a. Solenoid Disconnected, Mis-Wired, or

defective

b. Refrigerant Valve Stuck

Check/adjust set-points.

Allow time for unit to pull down

Instruct customer

Instruct Customer that unit performs best

between 60°F / 16°C - 90°F / 32°C

a. Adjust wine rack

b. See Door Adjustment procedure in section

2 of this manual.

c. Check hinges. Replace if defective.

a. Move to correct location.

b. Initiate Diagnostic Mode. If “EE” is dis-

played in place of evap temp, check elec-

trical connections back to J2 on control

board. Repair wiring or connections.

c. Check thermistor ohms = 30,000 - 33,000

at 32°F / 0°C. Replace if defective.

a. Check/clean condenser.

b. Tighten blade or move obstruction.

c. Check fan motor operation. Check fan

motor electrical connections back to com-

pressor. Check for 115V AC from fan

motor to compressor. Reconnect or repair

wires, or replace motor if defective.

a. Check fan blade position. Reposition

blade or move obstructions.

b. Check fan switch electrical connections.

Check for 115V AC to and from switch.

Reconnect or replace switch if defective.

c. Check fan motor electrical connections,

and check for 115V AC to motor. Repair

connections, replace motor if defective.

d. Check for 115V AC from J3 on control

board. (NOTE: Unit must be running and

not in Showroom Mode) If no power,

replace board.

a. Initiate Manual Valve Activation Mode.

1. If valve inoperative:

a. Check electrical connections.

b. Check solenoid resistance for 680

± 10% ohms. Replace if defective.

2. Toggle through temp readings, if oppo-

site evap temp drops, switch electrical

connections.

b. Initiate Manual Valve Activation Mode for

one side, then the other, while observing

evap temps. If only one side of valve acti-

vates, replace valve.

Page 13

PROBLEM POSSIBLE CAUSE TEST / ACTION

Wine Storage

Wine Storage (400-

(400-2

)Series

Series TroubleShoot Guide

7-13 #3758410 - Revision C - May, 2014

D. ACTUAL VS. DISPLAYED

TEMPERATURE OVER 10°

DIFFERENT

E. ACTUAL VS. DISPLAYED

TEMPERATURE LESS

THAN 10° DIFFERENT

F. EXCESSIVELY COLD TEM-

PERATURES IN BOTH

WINE STORAGE COM-

PARTMENTS

G. EXCESSIVELY COLD TEM-

PERATURES IN ONLY ONE

WINE STORAGE COM-

PARTMENT

H. LIGHTS STAY ON

I. NO LIGHTS

Wrong Units of Measure Selected,

(Fahrenheit - °F vs. Celsius - °C)

Compartment Thermistor Fault

(Misread), or Control Board Fault

Control Board DC Offset Out of

Adjustment

Room Temperature Below Set-Point

Control Set Too Cold

Door Ajar

a. Wine Rack Obstruction

b. Door out of Adjustment

c. Door or Cabinet Hinge Problem

Compartment Thermistor Fault

(Misread), or Control Board Fault

Room Temperature Below Set-Point

Control Set Too Cold

Door Ajar

a. Wine Rack Obstruction

b. Door out of Adjustment

c. Door or Cabinet Hinge Problem

Refrigerant Valve Stuck

Display Lighting Activated (ON 100%)

Fan & Light Switch Wiring Crossed

Light Switch Malfunction

Unit in Sabbath Mode

Light Switch Disconnected or

Malfunctioning

Light Strip Burned-out

No Power from Control Board

Initiate Temperature Units Selection Mode to

check units of measure (°F or °C) selected.

Check thermistor ohms = 30,000 - 33,000 at

32°F / 0°C. Replace if defective. If thermis-

tor is OK, replace control board.

Contact Factory for DC Offset Adjustment

Procedure.

Instruct Customer.

Check set-points. Adjust set-points WARMER

a. Adjust wine rack

b. See Door Adjustment procedure in section

2 of this manual.

c. Check hinges. Replace if defective.

Check thermistor ohms = 30,000 - 33,000 at

32°F / 0°C. Replace if defective. If thermis-

tor is OK, replace control board.

Instruct Customer.

Check set-point. Adjust set-points WARMER

a. Adjust wine rack

b. See Door Adjustment procedure in sec-

tion 2 of this manual.

c. Check hinges. Replace if defective.

Initiate Manual Valve Activation Mode for one

side, then the other, while observing evap

temps. If only one side of valve activates,

replace valve.

Press & release LIGHTS ON/OFF key.

Check wiring at fan & light switch, and at con-

trol board. Rewire if incorrect.

Press & release LIGHTS ON/OFF key, then

depress light switch. Repeat steps. If no

effect, replace switch.

Press & release UNIT ON/OFF key.

Check switch operation and electrical connec-

tions. Check for 115V AC to and from switch.

Reconnect wires or replace switch if defective.

If power from switch, replace light strip.

Check for 115V AC at E3 of control board. If

no power, replace board.

Page 14

PROBLEM POSSIBLE CAUSE TEST / ACTION

TroubleShoot Guide Wine Storage

Wine Storage (400-

(400-2

)Series

Series

7-14

#3758410 - Revision C - May, 2014

J. CONTROL PANEL KEYS

MALFUNCTIONING

K. NO LED’s

L. ALL LED’s LIT

M. SAME LED SEGMENTS

MISSING FROM BOTH DIS-

PLAY WINDOWS

N. LED SEGMENTS MISSING

FROM ONLY ONE DISPLAY

WINDOWS

O. DOOR / UNIT UN-LEVEL

Control Panel Ribbon Cable Plugged in

Wrong

Control Panel or Ribbon Cable

Defective (OR) No Signal Read at

Control Board

Unit Switched OFF

LED Ribbon Cable Plugged in Wrong

No Data from Control Board

Bad Data from Control Board

Bad LED Board in Control Panel

SEE SECTION 2 OF THIS MANUAL

Check control panel ribbon cable at control

panel (silver area of terminal away from con-

trol board). Plug in correctly if incorrect.

SEE CONTROL PANEL TEST PROCEDURE

AT BACK OF TROUBLESHOOTING GUIDE

SECTION.

Press UNIT ON/OFF key

Check LED ribbon cable. Plug in correctly if

incorrect.

Replace Control Board

Replace Control Panel Assembly

SEE SECTION 2 OF THIS MANUAL

Page 15

PROBLEM POSSIBLE CAUSE TEST / ACTION

Wine Storage

Wine Storage (400-

(400-2

)Series

Series TroubleShoot Guide

7-15 #3758410 - Revision C - May, 2014

P. “EE” Displayed in place of

Refrigerator Temperature

with “SERVICE” Flashing

Q. Warm or Normal

Temperatures Displayed

with “SERVICE” Alone

Flashing

R. Warm or Normal

Temperatures Displayed

with non-flashing “SER-

VICE” Displayed

S. Erratic Temperatures with or

without “SERVICE” Flashing

T. Warm Refrigerator

Temperatures, “SERVICE”

not displayed or Flashing

(Continued)

Refrigerator Compartment Thermistor

Disconnected, Shorted, or misread

Excessive Compressor Run

Evaporator Thermistor Disconnected,

Shorted, or misread

Error Codes Observed in Diagnostic

Mode, but not Cleared from Memory

Control Board Configured for Wrong

Model

No Power to Unit

Unit Switched OFF

Unit in Show Room Mode

Control Set Too High

Warm Food Load

High Room Ambient

Drawer Ajar

a. Food product obstruction

b. Drawer closer tripped backwards

Faulty Light Switch

Check refrigerator compartment thermistor

electrical connections from thermistor to

control board. Reconnect / repair connec-

tions. Check resistance of refrigerator com-

partment thermistor for 30,000 to 33,000

ohms at 32°F. Replace if defective.

Initiate Diagnostic Mode and see Error

Code Troubleshooting Guide

Check evaporator thermistor electrical con-

nections from thermistor to control board.

Reconnect / repair connections. Check

resistance of evaporator thermistor for

30,000 to 33,000 ohms at 32°F. Replace if

defective.

Enter diagnostic mode to observe error

codes. See Error Code Troubleshooting

Guide. Verify unit was repaired for error

codes displayed. Press and hold alarm key

for 15 seconds to clear error codes.

Initiate Manual Model Configuration Mode

and reconfigure to correct model.

Check power to unit, plug unit in or switch

supply circuit breaker ON.

Check for “OFF” displayed at LCD. If off,

press UNIT ON/OFF key.

Press UNIT ON/OFF key to OFF, then press

and hold WARMER& COLDER keys, and

press UNIT ON/OFF key.

Check set-point. If high, adjust.

Check contents of freezer for warm food

load. Instruct customer.

Instruct customer unit performs best

between 60°F(16°C) and 90°F(32°C).

a. Move obstruction.

b. Trip drawer closer forward

Check operation of light switches, lights off

when switch is depressed. Replace switch

if defective. (NOTE: Two light switches in

unit)

Page 16

PROBLEM POSSIBLE CAUSE TEST / ACTION

TroubleShoot Guide Wine Storage

Wine Storage (400-

(400-2

)Series

Series

7-16

#3758410 - Revision C - May, 2014

(Continued)

T. Warm Refrigerator

Temperatures, “SERVICE”

not displayed or Flashing

U. Product Temperature 10° or

More Colder than Displayed

Temperature

V. 1. “Extremely” Cold

Temperatures Displayed

•1° to 7° in Refrigerator

2. If outside US -

“Extremely” Warm

Temperatures Displayed

•34° to 45° in Refrigerator

W. No LCD

Refrigerator Compartment Fan Fault

a. Fan blade obstructed or out of position

b. Evaporator fan motor disconnected

c. Power to Fan Fault, or Fan Motor

Defective

Compartment Thermistor Disconnected,

Shorted, or misread

Compartment Thermistor Misread

1. Control Set to Display Celsius

2. If Outside US - Control Set to Display

Fahrenheit

Unit in Sabbath Mode

Display Wire Harness Disconnected or

Faulty

Control Panel Assembly Defective (OR)

No Signal Read at Control Board

a. Move obstruction or reposition blade.

b. Check electrical connections & continuity

from control board to motor. Reconnect /

repair bad connections.

c. With light switches depressed, check for

115V AC from control board to fan motor.

Replace control board if defective, or

Replace motor if defective.

Check refrigerator evaporator thermistor

electrical connections from thermistor to

control board. Reconnect / repair connec-

tions. Check resistance of refrigerator evap-

orator thermistor for 30,000 to 33,000 ohms

at 32°F. Replace if defective.

Check resistance of compartment thermistor

for 30,000 to 33,000 ohms at 32°F. Replace

if defective.

1. Change temperature units of measure to

Fahrenheit. Switch unit OFF, then ON, then

press & hold Bell key and UNIT ON/OFF

key for 10 seconds.

2. If Outside US - Change temperature units of

measure to Celsius. Switch unit OFF, then

ON, then press & hold Bell key and UNIT

ON/OFF key for 10 seconds.

Exit Sabbath Mode, press UNIT ON/OFF

key.

Check display wire harness and connec-

tions, including wires behind refrigerator

duct cover. Reconnect, repair, replace bad

wiring.

See Membrane Switch/Ribbon Cable Test

Procedures. If membrane switch fails any

test, replace entire control panel assembly.

If switch passes all tests, replace control

board.

Page 17

PROBLEM POSSIBLE CAUSE TEST / ACTION

Wine Storage

Wine Storage (400-

(400-2

)Series

Series TroubleShoot Guide

7-17 #3758410 - Revision C - May, 2014

X. No Lights

Y. Lights Stay ON when

Drawers Closed - (May be

Accompanied by /Drawer

Ajar Alarm Bell)

Z. Drawers Not Able to Close

Completely

AA. Drawers Uneven

No power to unit

Unit switched OFF

Unit in Sabbath Mode

Defective or loose light bulb(s)

Light Switch Disconnected or Defective

Lighting System Wiring Disconnected

or Defective

No Power From Control Board

(NOTE: See Unit in Sabbath Mode above.)

Door or Drawer Ajar

a. Food product obstruction

b. Drawer closer tripped backwards

Faulty Light Switch

Food Product Obstruction

Drawer Closer Tripped Backwards

Improper Drawer Panel Installation

Unit Not Level

Check / correct power supply to unit.

Switch unit ON, press UNIT ON/OFF key.

Exit Sabbath Mode, press UNIT ON/OFF

key.

Install a known good light bulb.

Check wire connections at light switch.

Reconnect/repair. Check for 115V AC to

and from light switch. Replace switch if

defective.

Check continuity from light sockets to

switch. Reconnect/repair or replace defec-

tive components.

Check for 115V AC from control board.

Replace board if defective.

(NOTE: See Unit in Sabbath Mode above.)

a. Move obstruction.

b. Trip drawer closer forward

Check operation of light switches, lights off

when switch is depressed. Replace switch

if defective. (NOTE: Two light switches in

unit)

Move obstruction.

Trip drawer closer forward

The drawers are non-adjustable. Instead,

the drawer panels must be adjusted if there

is an alignment problem. Refer to the

Installation Manual and/or installation video

for panel installation and adjustment.

Check levelness of unit. If un-level, turn

front leveling legs counterclockwise to raise

front or clockwise to lower it. Rear levelers

are adjusted from front of base by turning

adjusting screw clockwise to raise rear or

counterclockwise to lower it. Refer to the

Installation Manual and/or installation video

for complete installation and leveling instruc-

tions.

Page 18

TroubleShoot Guide Wine Storage

Wine Storage (400-

(400-2

)Series

Series

7-18

#3758410 - Revision C - May, 2014

SEALED SYSTEM DIAGNOSTIC INFORMATION

NOTES:

•The temperature/pressure table at right and the normal

operating pressures listed below are for reference only.

A unit's temperature/pressure correlation and normal

operating pressures may differ from those listed due to:

variations in evaporator thermistor location, set-points,

where the sealed system is in the refrigeration cycle,

ambient temperature, guage calibration, etc.

•If a unit is experiencing temperature problems, it is rec-

ommended to reference the Error Code Troubleshooting

Guide and General Troubleshooting Guide before

accessing the sealed system. After all mechanical and

electrical components have been ruled out, sealed sys-

tem pressures can be checked and compared against

those listed in the tables below.

•Whenever entering the sealed system, always use sol-

der-on process valves. Do NOT use bolt-on process

valves as they are prone to leak.

•Whenever servicing the sealed system, the valve assem-

bly (includes high-side filter-drier) must be replaced.

• Pressures listed below are based on a 70°F (21°C)

Ambient and and 38°F (3°C) set-points.

NORMAL OPERATING PRESSURES (70°F/21°C Ambient / 38°F/ 3°C Set-Point)

Model

424-2

427-2

(Wine)

(Ref)

430-2

Normal Low Side Pressures

0-12 PSI to 30-45 PSI

Normal High Side Pressures

75 psi to 120 psi

PRESSURE INDICATIONS

If low side pressure is

NORMAL

LOW

HIGH

& high side pressure is

NORMAL

LOW

HIGH

LOW

HIGH

possible problem is

MECHANICAL

(see General Troubleshooting Guide)

LEAK

RESTRICTION

INEFFICIENT COMPRESSOR

OVER CHARGE

427R-2

Pressure

10” Vac / -.69 Bar

7” Vac / -.48 Bar

4” Vac / -.28 Bar

0” Vac / 0 Bar

2 Psi / .14 Bar

4 Psi / .28 Bar

7 Psi / .48 Bar

9 Psi / .62 Bar

12 Psi / .83 Bar

15 Psi / 1.03 Bar

18 Psi / 1.24 Bar

22 Psi / 1.51 Bar

26 Psi / 1.79 Bar

30 Psi / 2.07 Bar

35 Psi / 2.41 Bar

40 Psi / 2.76 Bar

45 Psi / 3.10 Bar

51 Psi / 3.52 Bar

57 Psi / 3.93 Bar

64 Psi / 4.41 Bar

71 Psi / 4.90 Bar

78 Psi / 5.38 Bar

Temperature

-30°F / -34°C

-25°F / -32°C

-20°F / -29°C

-15°F / -26°C

-10°F / -23°C

-5°F / -21°C

0°F / -18°C

5°F / -15°C

10°F / -12°C

15°F / -9°C

20°F / -7°C

25°F / -4°C

30°F / -1°C

35°F / 2°C

40°F / 4°C

45°F / 7°C

50°F / 10°C

55°F / 13°C

60°F / 16°C

65°F / 18°C

70°F / 21°C

75°F / 24°C

TEMPERATURE / LOW-SIDE PRESSURE CORRELATION

Page 19

Wine Storage

Wine Storage (400-

(400-2

)Series

Series

Figure 7-1. Control Panel / Membrane Switch

WINE STORAGE MEMBRANE SWITCH / RIBBON CABLE TEST PROCEDURE

The membrane switch is that part of the control panel assembly consisting of the function keys used for all input

functions to the electronic control system. (See Figure 7-1)

Perform the eight continuity checks below if the integrity of the membrane switch and/or its ribbon cable is suspect.

To perform these continuity checks, the ribbon cable must be disconnected from the control board.

NOTE: The wires of the ribbon cable are exposed at the back side of the terminal housing. With an Ohm Meter,

check for continuity at these exposed points/pins. Pin #1 is at top of the terminal housing, closest to the arrow on

the housing (see Figure 8-1).

1. Pressing no keys on the membrane switch, check for continuity across all pin combinations. With no keys

pressed, there should be no continuity.

2. With UNIT ON/OFF key pressed, there should be continuity across pins #4 & #6 only.

3. With lower wine storage COLDER key pressed, there should be continuity across pins #2 & #3 only.

4. With lower wine storage WARMER key pressed, there should be continuity across pins #3 & #4 only.

5. With upper wine storage COLDER key pressed, there should be continuity across pins #2 & #6 only.

6. With upper wine storage WARMER key pressed, there should be continuity across pins #5 & #7 only.

7. With LIGHTS ON/OFF key pressed, there should be continuity across pins #5 & #6 only.

8. With alarm bell key pressed, there should be continuity across pins #3 & #7 only.

NOTE: If the membrane switch fails any of the above tests, the control panel assembly should be replaced. If all

tests are passed and the control panel is still inoperable, replace the control board.

Pin #1 at top

Ribbon Cable

Exposed points/pins on

back side of housing

Control Panel Assembly

TroubleShoot Guide

7-19 #3758410 - Revision C - May, 2014

Page 20

TroubleShoot Guide Wine Storage

Wine Storage (400-

(400-2

)Series

Series

7-20

#3758410 - Revision C - May, 2014

MODEL 427R-2 REFRIGERATOR MEMBRANE SWITCH / RIBBON CABLE TEST PROCEDURE

If the integrity of the refrigerator control panel assembly is suspect, continuity tests should be performed at the mem-

brane switch ribbon cable terminal housing. Begin by removing the control panel assembly from the unit and place it

on a solid surface. Disconnect the ribbon cable from control panel PC board.

How To Identify Pin 1 on Terminal Housing

The ribbon cable wires are exposed at the back of the terminal housing, but since there are two vendors of the

membrane switch, determining the location of pin 1 is not always easy. To identify the pins, follow these guidelines:

1. If terminal housing is BLUE, then pin 1 is closest to arrow on housing.

2. If terminal housing is BLACK, check for continuity between first and third pins at each end of housing while

pushing refrigerator WARMER key. If there is continuity, then pin 1 is at that end.

700BCI-3 Membrane Switch/Ribbon Cable Test Procedure

1. Press no keys on membrane switch. Check for continuity between all pin combinations. With no keys pressed,

there should be no continuity between any pins.

2. Press UNIT ON/OFF key, there should be continuity across pins 3 & 4.

3. Press Door Ajar Alarm ON/OFF key, there should be continuity across pins 2 & 4.

4. Press Refrigerator WARMER key, there should be continuity across pins 4 & 5.

5. Press Refrigerator COLDER key, there should be continuity across pins 1 & 3.

NOTE: If any of the tests show failure, replace entire control panel assembly.

UNIT

REFRIGERATOR

ON/OFF

WARMERCOLDER

Terminal Housing

NOTE: See “How To Identify Pin 1”, above.

Ribbon Cable

Membrane Switch in

Control Panel Assembly

Figure 7-2. Refrigerator Control Panel Assembly with Cut-Away View to Show Ribbon Cable

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