Fisher & Paykel E373 User manual

517672
Electronic
Single Temperature
Refrigerators
Models E373 & E450

517672 - JULY 2006 Reprint JANUARY 2007
Fisher & Paykel Appliances Ltd
78 Springs Road, East Tamaki
PO Box 58-732, Greenmount
Auckland, New Zealand
Telephone: [phone]
Facsimile: 09 273 0656
Fisher & Paykel Australia Pty Ltd
A.C.N. 003 335 171
19 Enterprise Street
P O Box 798
Cleveland, Queensland 4163
Telephone: [phone]
Facsimile: 07 3826 9164
COPYRIGHT FISHER & PAYKEL LTD 2006 - ALL RIGHTS RESERVED
2
The specifications and servicing procedures outlined in this manual are subject to change
without notice.
The latest version is indicated by the reprint date and replaces any earlier editions.
MODELS AND PRODUCT CODES
25648 RF373SLDW1 FP AA
25649 RF373SRDW1 FP AA
25650 RF373SRDW1 FP SG/HK
22099 E373L D FP WH 12
24874 E373LW1 FP AA
25050 E373LW1 FP AA
22098 E373R D FP WH 12
24873 E373RW1 FP AA
25052 E373RW1 FP AA
24872 E373RW2 FP SG
25279 E373RW2 FP SG
22557 E373VRW1 FP NZ
23950 E373R 1 FP WH SG
21279 E373R 1 FP WH SG
25646 RF450SLDW1 FP AA
25645 RF450SRDW1 FP AA
25647 RF450SRDW1 FP SG/HK
23957 E450L D FP WH
24855 E450LW1 FP AA
25051 E450LW1 FP AA
22170 E450L D FP WH 05
22105 E450L D FP WH 07
22101 E450L D FP WH 12
22305 E450L D FP WH 18
23958 E450L 1 FP WH IN
21278 E450L 1 FP WH SG
22103 E450LMFD D FP SM 12
22307 E450LMFD D FP SM 18
21282 E450LMFD 1 FP SM SG
22138 E450LXFD D FP SX 05
22107 E450LXFD D FP SX 12
22309 E450LXFD D FP SX 18
24854 E450LXFD1 FP AA
25122 E450LXFD1 FP AA
25549 E450LXFD1 FP AA
23960 E450R D FP WH
22169 E450R D FP WH 05
22104 E450R D FP WH 07
22100 E450R D FP WH 12
22312 E450R D FP WH 18
23959 E450R1 FP WH SG
21277 E450R 1 FP WH SG
22102 E450RMFD D FP SM 12
22306 E450RMFD D FP SM 18
21280 E450RMFD 1 FP SM SG
24852 E450RW1 FP AA
25049 E450RW1 FP AA
24858 E450RW2 FP SG
25346 E450RW2 FP SG
22106 E450RXFD D FP SX 12
22137 E450RXFD D FP SX 05
22308 E450RXFD D FP SX 18
24853 E450RXFD1 FP AA
25121 E450RXFD1 FP AA
25550 E450RXFD1 FP AA
24856 E450RXFD1 FP PH
24857 E450RXFD2 FP HK
24860 E450RXFD2 FP SG
25275 E450RXFD2 FP SG HK
25552 E450RXFD2 FP SG HK
22558 E450VRW1 FP NZ

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CONTENTS
1INTRODUCTION....................................................................................................................4
1.1 Electronics .............................................................................................................................4
1.2 Product Specification..............................................................................................................4
1.2.1 Compressors.....................................................................................................................4
1.2.2 Compressor Specification..................................................................................................4
1.3 Condenser Layout..................................................................................................................4
2ELECTRONICS .....................................................................................................................5
2.1 Control Module.......................................................................................................................5
2.2 Light Operation.......................................................................................................................5
2.3 Temperature Controller ..........................................................................................................5
2.4 Beeper/Alarm.........................................................................................................................5
2.5 Temperature Sensors.............................................................................................................5
2.6 Thermistor Sensor Resistance Table .....................................................................................6
2.7 Defrost Element .....................................................................................................................6
2.8 Thermal Fuses.......................................................................................................................6
2.9 Defrost Cycle..........................................................................................................................6
2.10 PC Fan...................................................................................................................................7
2.11 Fault Alarm.............................................................................................................................7
2.12 Compressor Starting ..............................................................................................................7
3FAULT CODES......................................................................................................................7
3.1 Fault Code Table....................................................................................................................7
3.2 To Disable Alarm....................................................................................................................9
3.3 To Manually Force A Defrost..................................................................................................9
4SERVICE PROCEDURES ...................................................................................................10
4.1 Control Module.....................................................................................................................10
4.2 Compressor Overload..........................................................................................................10
4.3 PC and Defrost Sensor ........................................................................................................10
4.3.1 Removal Of The Fan Cover.............................................................................................10
4.3.2 To Replace PC Sensor....................................................................................................11
4.3.3 To Replace Defrost Sensor..............................................................................................11
4.3.3.1 To Remove Evaporator Duct Cover........................................................................12
4.4 Variable Resistor..................................................................................................................12
4.5 Defrost Element ...................................................................................................................12
4.6 Fan Motor.............................................................................................................................12
5WIRING DIAGRAM..............................................................................................................13
6FAULT FINDING..................................................................................................................14
6.1 Compressor Won’t Start. ......................................................................................................14
6.2 Compressor Starts, Runs And Then Stops...........................................................................14
6.3 Compressor Humming .........................................................................................................14
6.4 PC Too Cold.........................................................................................................................14
6.5 PC Too Warm ......................................................................................................................14

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1 INTRODUCTION
The service manual covers the implementation of electronic control to Vertical Freezers.
1.1 Electronics
Changes to the single temperature models are that an electronic module has replaced the defrost
timer and relay. A variable resistor replaces the thermostat.
With the introduction of the electronic module, some of the current functions of the product will also
change. These will be covered under the appropriate headings.
The operational component such as the evaporator has also changed from the corrugated type
evaporator to the new Showa fin on tube evaporator. The condenser and cabinet do not change.
1.2 Product Specification
1.2.1 Compressors
Product Model
Compressor Part Number
Refrigerant Charge
E373/450
207119
100 grams R134a
1.2.2 Compressor Specification
Brand
Matsushita
Model
SF48C91RAW5
Part Number
207116
Volts
230/240
Hertz
50
Nominal BTU
470
Output Watts
138
Run Current (Amps)
0.50
Start Resistance (Ohms)
28.50
Run Resistance (Ohms)
18.20
Relay
F&P Electronic
Overload Part Number
Run Capacitor Part Number
207164
1.3 Condenser Layout
The new compressors have no oil cooler lines; therefore the re-routing of the condenser is as
follows:
Discharge line from the compressors runs directly to the waste water tray and then into the
condenser on the back panel. From the back panel it enters the LH side condenser (viewed from
the rear), through the cross rail heater (if applicable) then into the RH side condenser, then into the
filter dryer. The remaining layout remains unchanged.

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2 ELECTRONICS
2.1 Control Module
The electronic control module is situated in the unit compartment. It is connected to 220-240 volt
supply for switching of the compressor, defrost heater and PC fan. The compressor is switched
through a solid state Triac and relay, and the defrost heater through a relay. The compressor has
an external overload. The defrost and PC sensors are located on the front fan motor panel and
above the evaporator. A variable resistor replaces the thermostat, and is used to cycle the
refrigerator. The defrost timer has also been replaced by the control module.
2.2 Light Operation
The light globe remains at 230Volts 15 watt and is switched using the same light switch
mechanisms as with previous models, the plunger being depressed by the dairy cover to turn the
light on and off. The control module measures the current drawn from the light to determine
whether the door is opened or closed.
2.3 Temperature Controller
The temperature controller is a variable resistor located in the control box. It has replaced the
thermostat. The resistance range of this resistor is 0Ωto 1KΩ. The evaporator temperature range
varies between –15.5ºC at the lowest setting of 1, and -24ºC at the highest setting of 7. Mid
setting is -18ºC.
2.4 Beeper/Alarm
This is a piezo electric device located in the control module to provide the user with feedback on
fault alarms. If a fault occurs, the alarm only sounds when the door is opened. It turns off when
the door is closed.
2.5 Temperature Sensors
These are temperature-sensing devices, the resistance of which change with respect to
temperature. They have a single connector on the printed circuit board to ensure the integrity of
the resistance of the sensor is measured. Two sensors are located in the product. The PC sensor
is located in a pocket attached to the fan support to the left of the fan. The Defrost sensor, is
located on the under side of the evaporator.

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2.6 Thermistor Sensor Resistance Table
Temperature (ºC)
Resistance
(K Ω±5%)
-30.0
25.17
-25.0
19.43
-20.0
15.13
-15.0
11.88
-10.0
9.392
-5.0
7.481
0.0
6.000
5.0
4.844
10.0
3.935
15.0
3.217
20.0
2.644
25.0
2.186
30.0
1.817
35.0
1.518
40.0
1.274
45.0
1.075
50.0
0.9106
2.7 Defrost Element
The 230 volt 109 watt defrost element is located under the evaporator.
2.8 Thermal Fuses
Two thermal fuses are wired in series to the defrost element and located on the left hand top side
of the evaporator. To access the thermal fuses, the fan cover has to be removed.
2.9 Defrost Cycle
The defrost heater is controlled by the control module, which switches it via a relay. The defrost
interval can vary from between 8 hours and 16 hours of compressor run time, depending on the
duration time of the last defrost.
When the control module switches the compressor off for the defrost, there is a 2 minute delay
before the defrost heater is turned on. The defrost is terminated when the defrost sensor reaches
8º C. At the conclusion of the defrost there is a 4 minute delay after the defrost element has been
turned off before the compressor is turned on.
Defrost Cycle
Compressor switches off Defrost element switches off at 8º C
Defrost element Compressor switches
Switches off back on
2 minute 4 minute
delay delay
30 minute maximum defrost time
Normal Run Warm up Defrost Cycle Drip Time Normal Run
Time

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2.10 PC Fan
The PC fan is a 230v shaded pole motor. The fan cycles with the compressor and turns off when
the door is opened.
2.11 Fault Alarm
If the control module detects a fault, which it is unable to recover, an alarm is sounded. The alarm
only comes on when the door is opened. The number of beeps indicate the fault code. If the door
is closed, the alarm discontinues until the door is opened again.
2.12 Compressor Starting
The compressor is started by the control module. It is a timed start, therefore if the compressor
does not start within 1 second, the controller will cancel the start. If the compressor draws too
much current, the overload will activate and cut power to the compressor.
3 FAULT CODES
If a fault should develop in the temperature measuring system, defrost system, temperature control
variable resistor, or should the compressor fail to start, an audio fault alarm will sound when the
door is opened. The alarm consists of a number of beeps emitted by the beeper located in the
control module. The number of beeps emitted indicates the fault as shown in the Fault Code table
below.
3.1 Fault Code Table
Fault 2: 2 beeps
Reason: Defrost sensor failed to reach 8º C within 30 minutes. This has happened in
the last three defrosts, therefore probably defrost heater failure.
Action: Check connections at the control module and inline connectors.
Check defrost heater. If faulty, replace.
Fault 3: 3 beeps
Reason: The resistance of both sensors is outside the normal range (> 45K Ohms)
Primary Action: Check the 4-way connector at the control module.
Secondary Action: Check sensor resistance.
Re-terminate the 4-way connector.
Tertiary Action: Replace control module.
Fault 4: 4 beeps
Reason: The resistance of both sensors is outside the normal range (< 660 Ohms).
Primary Action: Check the 4-way connector at the control module.
Secondary Action: Check sensor resistance.
Re-terminate the 4-way connector.
Tertiary Action: Replace control module.

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Fault 7: 7 beeps
Reason: The resistance of defrost sensor is outside the normal range (> 45K Ohms).
Primary Action: Check the 4-way connector at the control module.
Secondary Action: Check sensor resistance.
Re-terminate the 4-way connector.
Tertiary Action: Replace control module.
Fault 8: 8 beeps
Reason: The resistance of defrost sensor is outside the normal range (< 660 Ohms).
Primary Action: Check the 4-way connector at the control module.
Secondary Action: Check sensor resistance.
Re-terminate the 4-way connector.
Tertiary Action: Replace control module.
Fault 9: 9 beeps
Reason: The resistance of the PC sensor is outside the normal range.
(> 45K Ohms)
Primary Action: Check the sensor connection at the power module.
Check sensor resistance.
Secondary Action: Replace control module.
Fault 10: 10 beeps
Reason: The resistance of the PC sensor is outside the normal range.
(< 660 Ohms)
Primary Action: Check the sensor connection at the power module.
Check sensor resistance.
Secondary Action: Replace control module
Fault 11: 11 beeps
Reason: Compressor has failed to start after 5 attempts.
Primary Action: Check the integrity of the compressor and components.
Replace components if found faulty.
Secondary Action: Replace control module
Fault 12: 12 beeps
Reason: The control variable resistor has an open circuit fault.
Primary Action: Check the continuity of the circuit between the variable resistor and the control
module and the connections at the variable resistor and the control module.
Secondary Action: Replace control module
Fault 19: 19 beeps
Reason: Electronic mismatch between electronics and model of cabinet.
Primary Action: Replace electronic module and reinitialise.

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3.2 To Disable Alarm
Turn the variable resistor (control knob) fully clockwise and then fully anticlockwise within 5
seconds.
3.3 To Manually Force A Defrost
Open the door, push the light plunger in and hold in, turn the variable resistor (control knob) to the
warmest setting then turn it to the coldest setting within ten seconds.
Note: There will be a two minute delay before the defrost element comes on if the temperature of
the evaporator is below 8º C.

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4 SERVICE PROCEDURES
Note: No work is to be carried out on the product while in a live situation. All components can be at
a 230-volt potential. The product is to be turned off and disconnected from the power supply.
Electrical Safety Check.
Whenever any part of the electrical circuit is serviced or disturbed in the course of carrying out
service adjustments or repair, it is essential that insulation and earth continuity checks are carried
out using the appropriate test equipment.
4.1 Control Module
Remove the drain pan/tray.
Remove the two screws securing the module to the cabinet.
Pull the module outwards.
Remove all the connectors from the control module.
Refit the module in reverse order making sure all wiring is secured in the module and the
wiring harness is located in the module slot.
4.2 Compressor Overload
Remove the compressor cover. Once the cover is removed, the compressor connector from the
module needs to be removed before the overload is removed by pulling it off the compressor
terminals. An Ohmmeter is used to test for continuity of the overload.
4.3 PC and Defrost Sensor
The PC and defrost sensor are tested at the module. The module is to be removed and the sensor
RAST connector can be removed for testing.
4.3.1 Removal Of The Fan Cover
Remove all the shelves from the product.
Remove front duct cover.
Place hand under the middle of the
evaporator cover.
Pressure is applied to the cover in an
outward motion.

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The cover will bend slightly and come away
from the cabinet liner.
4.3.2 To Replace PC Sensor
Location of PC Sensor.
Unplug the product from the power source.
Remove PC duct cover.
Remove fan cover.
Remove the affect sensor from its holder.
Cut the sensor from the loom and replace it by soldering and heat shrinking the new sensor.
Replace sensor into its holder.
Replace fan cover.
4.3.3 To Replace Defrost Sensor
Location of Defrost Sensor
Unplug the product from the power source.
Remove duct cover.
Remove fan cover.
Disconnect fan terminals off fan and remove sensor from housing.
Remove two screws holding fan housing and unclip fan housing from evaporator cover duct.
Tilt the evaporator towards front of product to expose defrost sensor located on the left hand
under side of evaporator. (Note:- If the sensor is difficult to remove, the evaporator duct will
need to be removed.)
Remove the affect sensor from its holder.
Cut the sensor from the loom and replace it by soldering and heat shrinking the new sensor.
Replace sensor into its holder.
Reassemble components in reverse. Ensure the foam pads are placed back into position.

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4.3.3.1 To Remove Evaporator Duct Cover
Unplug the product from the power source.
Remove duct cover.
Remove fan cover.
Disconnect fan terminals off fan and remove sensor from housing.
Remove two screws holding fan housing and unclip fan housing from evaporator cover duct.
The evaporator is held in place by a clip on the back wall of the cabinet. Lift the evaporator
vertically by approximately 15mm.
Tilt the evaporator to expose a clip holding the evaporator to the evaporator duct cover and
remove the clip.
The evaporator duct cover will slide down and off the evaporator.
Cut the sensor from the loom and replace it by soldering and heat shrinking the new sensor.
Replace sensor into its holder.
Refit the evaporator duct cover ensuring the evaporator ends are inside the duct.
Reclip the evaporator to the evaporator duct cover.
Reassemble the product in reverse order.
4.4 Variable Resistor
Unplug the product from the power source.
Remove control box by removing the two screws holding control box in place.
Unclip and remove the top from control box to expose variable resistor.
Unplug the Molex plug from the harness and remove terminals off the light mechanism.
Loosen nut holding variable resistor and remove resistor and connected wiring. (Replace all
the wiring and variable resistor as one. Do not attempt to replace variable resistor on its
own.)
Reassemble in reverse order.
4.5 Defrost Element
The 230 volt 109 watt defrost element is an embedded element. The defrost element is not a
replaceable item. In the event of a defrost element failure the evaporator will need to be replaced.
4.6 Fan Motor
Unplug the product from the power source.
Remove duct cover.
Remove fan cover.
Disconnect fan motor.
Remove two screws holding fan housing in place and remove housing.
Replace fan motor and reassemble in reverse order.

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5 WIRING DIAGRAM



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6 FAULT FINDING
The following faults and probable causes have been listed with the assumption that all basic
checks have been carried out, such as the product has power, the door is closing correctly, etc.
6.1 Compressor Won’t Start.
Check continuity of overload. If no continuity, replace overload.
Check start and run winding (as per specification).
Check run capacitor.
(Manual starting devices can be used to confirm diagnostics.)
6.2 Compressor Starts, Runs And Then Stops.
Check the connections at the fusite plug, overload and control module connections.
Check supply voltage.
(Manual starting devices can be used to confirm diagnostics.)
6.3 Compressor Humming
Check continuity of overload. If no continuity, replace overload.
Check connections at fusite plug, overload and control module connections.
Check start and run windings (as per specifications).
Check run capacitor.
6.4 PC Too Cold
Check resistance of variable resistor.
Check resistance of PC sensor as per table.
Check evaporator for frost pattern. A full frost pattern is required. If there is not a full frost
pattern, check product for shortage of refrigerant or inefficient compressor.
Check evaporator temperatures at the entry and exit of the evaporator. If the temperature of
the exit differs by more than 5 to 10ºC of the entry temperature, further investigation is
required.
6.5 PC Too Warm
Check setting of control knob.
Check resistance of variable resistor.
Check resistance of PC sensor as per table.
Check that the fan is operational.
Check if evaporator is defrosting correctly. If not, check the defrost sensor and/or defrost
element.
If defrost is working, check temperature of the evaporator to rule out or confirm system
and/or compressor fault/s.