Fujitsu AWYZ14LBC Original operating manual

SPLIT TYPE
ROOM AIR CONDITIONER
CEILING WALL
type
Models Indoor unit Outdoor unit
AWYZ14LBC
AWYZ18LBC
AOYZ14LBC
AOYZ18LBC
INVERTER
SERVICE
INSTRUCTION
R410A

CONTENTS
1. SPECIFICATION
AWYZ14/18LBC, AOYZ14/18LBC...................................................................................
2. DIMENSIONS
AWYZ14/18LBC, AOYZ14/18LBC...................................................................................
3. REFRIGERANT SYSTEM DIAGRAM
AWYZ14/18LBC, AOYZ14/18LBC...................................................................................
4. CIRCUIT DIAGRAM
AWYZ14/18LBC, AOYZ14/18LBC...................................................................................
5. DESCRIPTION OF EACH CONTROL OPERATION
1. COOLING OPERATION..............................................................................................
3. DRY OPERATION......................................................................................................
2. HEATING OPERATION..............................................................................................
5. INDOOR FAN CONTROL...........................................................................................
4. AUTO CHANGEOVER OPERATION.........................................................................
7. LOUVER CONTROL...................................................................................................
6. OUTDOOR FAN CONTROL.......................................................................................
9. TIMER OPERATION CONTROL................................................................................
8. COMPRESSOR CONTROL........................................................................................
11. TEST OPERATION CONTROL..................................................................................
10. ELECTRONIC EXPANSION VALVE CONTROL........................................................
13. FOUR-WAY VALVE EXTENSION SELECT...............................................................
12. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )................................
15. MANUAL AUTO OPERATION ( Indoor unit body operation ).....................................
14. AUTO RESTART........................................................................................................
16. FORCED COOLING OPERATION.............................................................................
18. COIL DRY OPERATION CONTROL..........................................................................
17. COMPRESSOR PREHEATING..................................................................................
20. DEFROST OPERATION CONTROL..........................................................................
22. VARIOUS PROTECTIONS.........................................................................................
21. OFF DEFROST OPERATION CONTROL..................................................................
01-01
02-01
03-01
04-01
05-01
05-02
05-03
05-04
05-05
05-07
05-08
05-09
05-10
05-12
05-12
05-12
05-12
05-13
05-13
05-13
05-13
19. UV FILTER CLEANING CONTROL............................................................................ 05-14
05-16
05-18
05-19
05-12

6. REFRIGERANT CAUTION -R410A-
1. R410A TOOLS............................................................................................................
3. PRECAUTION FOR SERVICING...............................................................................
2. PRECAUTION FOR INSTALLATION.........................................................................
5. DEFFERENCE FROM CONVENTIONAL MODEL(R22) AND PRECAUTIONS........
4. NEW REFRIGERANT R410A.....................................................................................
7. TROUBLE SHOOTING
1. WHEN THE UNIT DOES NOT OPERATE AT ALL....................................................
3. TROUBLE SHOOTING METHOD
2. SELF DIAGNOSIS FUNCTION..................................................................................
1. EXPLODED VIEW......................................................................................................
2. INVERTER ASSEMBLY SPECIFICATION.................................................................
8. APPENDING DATA
1. JUMPER SETTING OF INDOOR UNIT AND OUTDOOR UNIT................................
3. THERMISTOR RESISTANCE VALUES.....................................................................
4. CAPACITY/INPUT DATA...........................................................................................
2. OUTDOOR UNIT PRESSURE VALUE AND TOTAL ELECTRIC
CURRENT CURVE...................................................................................................
9. REPLACEMENT PARTS
10. INSTALLATION MANUAL
4. SELF-DIAGNOSIS FUNCTION AND CHECKING POINTS.......................................
5. SERIAL SIGNAL DIAGNOSIS....................................................................................
6. IPM PROTECTION.....................................................................................................
8. TROUBLE SHOOTING OF REFRIGERANT CYCLE.................................................
06-01
06-02
06-04
06-05
06-08
07-01
07-02
07-03
07-07
07-08
7. ACTIVE FILTER FAILURE..........................................................................................07-09
08-01
08-02
08-08
08-09
09-01
09-14
07-10

1 . SPECIFICATIONS
R410A
CEILING WALL type
INVERTER

SPECIFICATIONS
TYPE (COOL&HEAT INVERTER) (COOL&HEAT INVERTER)
INDOOR UNIT AWYZ14LBC AWYZ18LBC
OUTDOOR UNIT AOYZ14LBC AOYZ18LBC
COOLING CAPACITY( ) : Range (kW) 4.2 (0.9~5.3) 5.2 (0.9~5.9)
HEATING CAPACITY( ) : Range (kW) 6.0 (0.9~9.1) 6.7 (0.9~9.7)
POWER SOURCE (V) 230
FREQUENCY (Hz) 50
RUNNING CURRENT (A) COOLING 4.5
5.9 7.2
1.63 (0.09~3.20)1.35 (0.09~2.95)
6.9
HEATING
INPUT WATTS (kW) COOLING 1.02 (0.09~1.75) 1.58 (0.09~2.00)
HEATING
EER (kW/kW) COOLING 4.12 3.29
4.44 4.11
2.8
HEATING
MOISTURE REMOVAL 2.1
AIR CIRCULATION-Hi (m3/hr) 850 850
ELECTRICAL DATA
COMPRESSOR
Note : Always use a vacuum pump to purge the air.
Refrigerant for purging the air is not charged in the outdoor unit at the factory.
DIMENSIONS
TYPE Hermetic type,4 pole, 3 phase , DC inverter motor, Rotary
DISCRIMINATION 808-907-80
REFRIGERANT R410A (g)
(r.p.m.)
(r.p.m.)
1,350 1,350
POWER SOURCE (V) 230
HI-SPEED
MED-SPEED
INDOOR UNIT
LO-SPEED
QUIET
C 1,300 H 1,390
C 1,120 H 1,200
C 950 H 1,000
C 700 H 760
C 1,300 H 1,390
C 1,120 H 1,200
C 950 H 1,000
C 700 H 760
OUTDOOR UNIT 800
INDOOR UNIT H x W x D (mm)
H x W x D (mm)
275 x 790 x 215
OUTDOOR UNIT 540 x 660 x 290
FAN MOTOR
(dB)
(dB)
HI-SPEED
MED-SPEED
INDOOR UNIT LO-SPEED
QUIET
C 46 H 46
OUTDOOR UNIT
NOISE LEVEL
20 m
15m chargeless, 20g/m (>15m)
WEIGHTS
INDOOR UNIT
OUTDOOR UNIT
808-907-80
( /hr)
C 46 H 46
C 43 H 39 C 43 H 39
C 35 H 34 C 35 H 34
C 29 H 29 C 29 H 29
S-QUIET C 24 H 24 C 24 H 24
C 46 H 47 C 47 H 48
Note : Noise was measured in accordance with JIS standards, Japan.
GROSS / NET (kg)
GROSS / NET (kg)
12 / 9
35 / 34 35 / 34
MAX PIPE LENGTH
ADDITIONAL REFRIGERANT
THICKNESSES OF ANNEALED COPPER PIPES
Nominal diameter
1/4
5/8
Outer diameter (mm)
6.35
12.7
R410A
0.80
0.80
[ref,] R22
0.80
0.80
Thickness (mm)
01-01

2 . DIMENSIONS
R410A
CEILING WALL type
INVERTER

DIMENSIONS
Models : AWYZ14LBC / AOYZ14LBC
AWYZ18LBC / AOYZ18LBC
02-01
(Unit : mm)
2,000
300
298
899
250
170
40
300
540 125
508
60
790
320
52
578
10
20

3 . REFRIGERANT SYSTEM DIAGRAM
R410A
CEILING WALL type
INVERTER

REFRIGERANT SYSTEM DIAGRAM
Models : AWYZ14LBC / AOYZ14LBC
AWYZ18LBC / AOYZ18LBC
03-01
Liquid pipe : 6.35 mm
Gas pipe : 12.7 mm
2-Way Valve
Strainer
Strainer
Muffler
Muffler
Receiver
Heat exchanger B
( INDOOR )
3-Way Valve
4-Way Valve
Pulse motor valve
Heat exchanger
( INDOOR )
Heat exchanger
( OUTDOOR )
Accumulator
Compressor
Cooling
Heating

4 . CIRCUIT DIAGRAM
R410A
CEILING WALL type
INVERTER

CIRCUIT DIAGRAM
Models : AWYZ14LBC / AOYZ14LBC
AWYZ18LBC / AOYZ18LBC
04-01
INDOOR UNIT
OUTDOOR UNIT
BROWN
RED
BLACK
WHITE
RED
BROWN
BLACK
YELLOW
BLUE
RED
BLACK
WHITE
YELLOW
BROWN
BLACK
BLACK
RED
BROWN
BLUE
ORANGE
YELLOW
WHITE
BROWM
RED
ORANGE
YELLOW
GREEN
BLUE
PURPLE
GRAY
WHITE
BLACK
BLACK
WHITE
RED
BLUE
BLUE
BLACK
BLACK
BROWN
BROWN
GREEN
BROWN
ORANGE
BLACK
RED
WHITE
PURPLE
BROWN
RED
ORANGE
YELLOW
RED
WHITE
BLACK
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
1
2
3
4
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
1
2
3
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
CN60
CN61
CN62
W4
W2
W1
W3
W7
W8
TM01
TM02
CN42
CN800
CN70
CN41
CN40
TM03
TM04
CN400
CN11
+
-
N1
P
I O
N2
L1 L2
CN301
1
2
3
1
2
3
CN302
CN303
TM301P N TM302
D201
+
-
DISCHARGE TEMP. THERMISTOR
PIPE TEMP. THERMISTOR
OUTDOOR TEMP. THERMISTOR
FUSE
20A-250V
TERMINAL
N L 3
4-WAY VALVE
EXPANSION VALVE
FAN MOTOR
PMV
4WV
F M
CN700
CN500
R
S
C
(U) (W)
(V)
C M
COMPRESSOR
TM303
W
TM304
V
TM305
U
CHOKE COIL
ACTIVE FILTER
MODURE
CONTROLLER
PCB ASSY
TRANSISTOR
PCB ASSY
RED
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
RED
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
RED
RED
RED
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
RED
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
BLUE
YELLOW
WHITE
BLACK
RED
WHITE
WHITE
WHITE
WHITE
RED
RED
WHITE
WHITE
WHITE
WHITE
BLUE
PURPLE
GRAY
WHITE
BLACK
BROWN
RED
ORANGE
YELLOW
GREEN
BLACK
BLACK
BLACK
BLACK
BLACK
WHITE
BLUE
RED
RED
WHITE
WHITE
WHITE
RED
WHITE WHITE
GREEN / YELLOW
WHITE
BLACK
RED
GRAY
BLUE
BROWN
RED WHITE
WHITE
WHITE
WHITE
WHITE
WHITE WHITE
WHITE
RED
RED
WHITE WHITE WHITE WHITE
WHITE RED
RED WHITE
WHITE
WHITE
BROWN RED ORANGE YELLOW
RED
BROWN ORANGE
YELLOW
CN205
CN206
CN201 CN200 CN203 CN202 CN204
CN3
CN4
CN16
CN9
CN6 CN7 CN17 CN12
CN210
CN15
CN11
CN208
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
11
10
9
8
7
6
5
4
3
2
1
11
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
6
5
4
3
2
1
6
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
6
7
8
9
10 2
1
5
43
2
1
5
4
3
2
1
5
43
2
1 6
5
4
3
2
1
5
4
3
2
1
43
2
1
2
1
8
7
6
2
1
5
43
2
1
2
1
8
7
6
5
4
32
1
8
7
6
5
4
3
2
1
5
4
32
1
2
1
4
32
1
4
32
1
32
1
32
1
32
1
2
1
TERMAL
FUSE 102 NL3
4
3
3
1
1
3
TERMAL
FUSE 102
TERMAL
FUSE 102
POWER RELAY
SWITCH (LEFT)
SWITCH
(RIGHT)
AIR FILTER (LEFT)
AIR FILTER (RIGHT)
TM1 TM2
M
M
POWER
SOURCE
TERMINAL
TEST
ROOM TEMPERATURE THERMISTOR
PIPE TEMPERATURE THERMISTOR
F M
M
M
M
M
DIFFUSER
LOUVER Z
LOUVER U
RIGHT-LEFT LOUVER
CONNECTOR (WHITE)
CONNECTOR (WHITE)
CONNECTOR (RED)
CONNECTOR (RED)
UV-LED
UNIT
RECEIVER PCB
W3
CONTROLLER PCB
INDICATOR PCB
CONNECTOR BOARD

4. NEW REFRIGERANT R410A
What is HFC ?
Phase-out schedule of HCFC according to Montreal protocol
1996 20102000 2004 2015 2020 2030
60
40
20
100
(Year)
(%)
80
(HCFC consumption of 1989) +
(CFC consumption of 1989) x 2.8%
65%
35%
10%
0.5%
started control
only service use
total abolition
100% =
0
*
06-05

Ozone Layer depleting mechanism
CFC
CFCl2
Cl Ozone
(O3)O2
ClO
Cl
sunbeam
What is CFC and HCFC?
CFC : Chloro-Fluoro-Carbon
High ODP( ozone depletion potential ) chemical compound, including chlorine. (ODP:0.6-1.0)
For example : R12 (for refrigerator and car air-conditioner)
Low ODP chemical compound, including chlorine and hydrogen. (ODP:0.02-01)
HCFC : Hydro-Chloro-Fluoro-Carbon
For example : R22 (for air-conditioner)
R134a (for Car air conditioner)
HFC3: Hydro-Fluoro-Carbon
R407C (for air conditioner)
Refrigerant characteristics
R22
Composition
(wt%)
R22
(100)
Boiling Point - 40.8
Behavior ---
Pressure at 54.5 C
(kPa)
2,151
Temperature Glide
(deg)
0
ODP 0.055
R407C
R32/R125/R134a
(23/25/52)
- 43.6
zeotrope
2,262
5.4
0
R410A
R32/R125
(50/50)
- 51.4
near azeotrope
3,406
0.11
0
06-06

Summary of R407C and R410A characteristics
Pressure (Mpa) Temp ( C)
2.20 37.9
2.25 38.7
2.30 39.6
2.35 40.5
2.40 41.3
2.45 42.1
2.55 43.8
2.60 44.6
2.65 45.3
2.70 46.1
2.75 46.8
2.80 47.6
2.85 48.3
2.90 49.0
2.95 49.8
3.00 50.5
3.05 51.2
3.10 51.9
3.15 52.6
3.20 53.2
3.25 53.9
3.30 54.6
3.35 55.3
3.40 55.9
3.45 56.5
3.50 57.1
2.55 57.8
3.60 58.4
3.65 59.0
3.70 59.6
3.75 60.2
3.80 60.8
3.85 61.4
3.90 52.0
3.95 62.5
4.00 63.1
4.05 63.6
4.10 64.2
4.15 64.8
Temp ( C) Pressure (Mpa)
39 2.27
40 2.32
41 2.38
42 2.44
44 2.57
45 2.63
46 2.69
47 2.76
48 2.83
49 2.90
51 3.04
52 3.11
53 3.18
54 3.26
56 3.41
57 3.49
58 3.57
59 3.65
61 3.82
62 3.90
63 3.99
64 4.08
Desighed pressure of R410A refrigerant
< Pressure Temp >
Relation between R410A condensing temperature and saturated pressure.
< Temp Pressure >
Advantage
Disadvantage
Suitable for
R410A
higher system
performance
Near-Azeotropic
refrigerant
1.6 times higher
(difficult to design against
pressure resistance)
Small Air-Conditioners
pressure than R22
R407C
similar pressure as R22
(possible to design
large equipment)
Zeotropic refrigerant
(handle with care)
Large Air-Conditioners
*
05-07

OIL
• Use new synthetic oils such as ester because HFC series refrigerant has less solubility with mineral oils
conventionally used for R22.
• As these new synthetic oils are easily influenced by moisture and dusts, they must be treated more care-
fully than the conventional lubricating oils.
CAUTION
For installation/servicing, take more precautions than the case of conventional refrigerants to avoid moisture
and dusts entering the refrigerant circuit. Also, for storing parts, more precautions must be taken.
2, 3-WAY VALVE
• Review material O-ring, valve core seal for securing suitability with oil.
CAUTION
Check if the valve is suitable for the refrigerant (model) when replacing.
CAUTION
Check if the compressor is suitable for the refrigerant (model) when replacing. Complete welding within 15
minutes after opening the cap when replacing.
COMPRESSOR
• Use better grade of material for sliding parts for securing good lubrication of sliding part as HFC
refrigerant does not contain chloride.
• Review insulating materials
• Increase pressure resistance strength
CAUTION
During storage, due care must be taken so that foreign matters such as dust and water do not enter.
HEAT EXCHANGER
• Review the water,contaminants controlling level
• Use thinner tube to increase pressure Increase capacity for resistance strength (only outdoor unit)
improving performance
CAUTION
Check if the valve is suitable for the refrigerant (model) when replacing.
4-WAY VALVE
• Review materials
5. DEFFERENCE FROM CONVENTIONAL MODEL (R22) AND PRECAUTIONS
06-08

7 . TROUBLE SHOOTING
R410A
CEILING WALL type
INVERTER
1. When the unit does not operate at all (Operation lamp and Timer lamp do not light up)
2. Self Diagnosis Function (Either Operation lamp or Timer lamp is blinking)
* How to operate the self-diagnosis function
* Self- diagnosis table and Check points
3. Trouble shooting method
* Serial signal check
* IPM protection check
* Refrigeration cycle diagnosis

Does not operate at all (Operation Lamp and Timer Lamp do not light up)
[Check Point]
(1) Is the input power voltage from the exclusive circuit AC outlet normal?
(2) Is the AC plug inserted to the AC outlet securely and not loose?
(4) Check if each connector is inserted securely.
[Checking Flow Chart]
YES (AC220/230V)
YES (AC220/230V)
YES (AC260~400V)
YES (DC5V)
(IC5, T1 or IC8,11 defective)
YES (DC15V)
YES (DC5Vp-p, Pulse wave of 60Hz)
Controller PCB defective
NO
NO
NO
NO
NO
NO
NO
LCC:(F2, D1, T2 defective)
LDC:(F2, D1, L2 defective)
LCC:(IC2, T1, IC3 defective)
LDC:(IC5, T1, IC15 defective)
(F1, VA1 defective)
07-01
Does not connected cable do wrong wiring?(3)
LDC (C9:DC20, C10:DC13.5V 1V)
YES LCC (C7:DC20, C12:DC13.5V 1V)
Is AC input voltage from AC outlet normal ? Fault of an input power supply.
Is AC voltage between VA 1 normal? Switching power circuit
LCC: Is DC voltage between terminal of C4 normal?
LDC: Is DC voltage between terminal of C5 normal?
Switching power circuit
Switching power circuit
LCC: Is DC voltage between terminals of C7 & C12 normal?
LDC: Is DC voltage between terminals of C9 & C10 normal?
LCC: Is DC voltage between terminals 3 & 4 of IC7 normal?
LDC: Is DC voltage between terminals 3 & 4 of IC8 normal?
Is DC voltage between terminals of C17 normal? LCC: IC6 defective
LDC: IC7 defective
LCC: IC4 defective
LDC: IC13 defective
LCC: IC7 defective
LDC: IC8 defective
LCC: Is DC voltage between terminals of C9 normal?
LDC: Is DC voltage between terminals of C24 normal?
YES (AC220/230V)
NO
Is AC voltage between 4pin of W1 and K1 normal?
Temp fuse defective

SELF-DIAGNOSIS FUNCTION
This function memorizes the self-diagnosis function (lamp display) in the in door control P.C.Board
when trouble occurs.
(The memory contents are not destroyed even when the power cord is unplugged from the AC outlet.)
The self-diagnosis function (lamp display) can also be switched between major classification display
and minor classification display and precise diagnosis can be made.
Self-diagnosis function [lamp display] (memory reading)
(1) When error occurs, it is indicated by blinking [Operation lamp (Red)] and [Timer lamp (Green)].
(2) Upon pulling out and inserting the AC plug, the starts to operates from remote control.
(At this state, a normal operation indication is performed.)
(3) By pressing [TEST] button of remote control, [Error Indication] is indicated only
during
[3 minutes ST].
(3 minutes ST : 2 minutes 20 seconds from the timing AC plug is ON)
[Lamp display]
3 minutes delay
Turn off Operating Error Indication Normal indication after
3min.ST
Indication
AC Plug ON Start operation Input TEST signal
How to erase Memory
(1)
(Indoor unit buzzer beeps 3 seconds.)
07-02
While [Error indication] is ON by the self-diagnosis function, the memorized contents can be
erased by pressing [Forced Auto Button] on the main unit.

Self - diagnosis function and Checking points
Error Indication
Operation
(RED)
Timer
(GREEN)
Error
(Protection)
Diagnosis Method
0.5 sec
2 times
When the indoor unit does not receive the signal for 10 consecutive seconds during the operation >Permanent stop after 30
seconds.
The outdoor unit does not receive the signal for 10 consecutive seconds from the time when the power relay was ON.
>Outdoor unit stops.
OFF
07-03
Serial forward transfer error
during the operation
Serial forward transfer error
at starting up operation
Serial reverse transfer error
during the operation
Serial reverse transfer error
at starting up operation
At the start up, the indoor unit does not receive the signal for 10 consecutive seconds from the time when the power relay was ON.
>Permanent stop after 30 seconds.
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor
unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor
unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor
unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)
When the outdoor unit does not receive the signal for 10 consecutive seconds during the operation > Outdoor unit stops.
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor
unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)
The room temperature thermistor detective a abnormai temperature when the power was turned on. > Remote control does not
operate.
[Diagnosis Point]
Check thermistor resistance value (Refer to "Themistor characteristics table").
Controller PCB defective.
The detection value of the indoor heat exchanger thermistor is either open or shoted when the power is ON. > Remote control dose
not operate.
[Diagnosis Point]
Check thermistor resistance value (Refer to "Themistor characteristics table").
Controller PCB defective.
Room temperature therm-
istor defective
Indoor heat exchanger
thermistor error
0.5 sec
3 times
0.5 sec
4 times
0.5 sec
5 times
0.5 sec
2 times
0.5 sec
3 times
0.5 sec
2 times

Self - diagnosis function and Checking points
Error Indication
Operation
(RED)
Timer
(GREEN)
Error
(Protection)
Diagnosis Method
0.5 sec
2 times
The detection value of the outdoor heat exchanger thermistor is either open or shorted.
> Compressor, outdoor fan : OFF (It automatically releases when the normal value is detected.)
The detection value of the outdoor temperature thermistor is either open or shorted.
> Compressor, outdoor fan : OFF (It automatically releases when the normal value is detected.)
0.5 sec
3 times
07-04
Forced auto switch error
Outdoor temperature ther-
mistor error
Outdoor heat exchanger
thermistor error
Discharge thermistor error The detection value of the discharge thermistor is either open or shorted.
> Compressor, outdoor fan : OFF (It automatically releases when the normal value is detected.)
[Diagnosis Point]
Check thermistor resistance value (Refer to "Thermistor characteristics table").
Controller PCB defective.
[Diagnosis Point]
Check thermistor resistance value (Refer to "Thermistor characteristics table").
Controller PCB defective.
[Diagnosis Point]
Check thermistor resistance value (Refer to "Thermistor characteristics table").
Controller PCB defective.
Forced auto switch becomes ON for 30 consecutive seconds.
> It indicates the error but the operation continues.
[Diagnosis Point]
Check if forced auto switch is kept pressed.
Forced auto switch defective.
Controller PCB defective.
After 2 minutes 20 seconds of stopping operation, the signal from outdoor unit is received even though the main relay is OFF.
> Main relay OFF continues (outdoor unit OFF command)
[Diagnosis Point]
Main relay defective
Controller PCB defective.
The power supply frequency can not be recognized after 4 seconds of power ON.
> Permanent stop.
[Diagnosis Point]
Controller PCB defective.
Main relay error
Power supply frequency
detection error
0.5 sec
3 times
0.5 sec
4 times
0.5 sec
2 times
0.5 sec
3 times
0.5 sec
4 times
0.5 sec
4 times