Troubleshooting by Error Code
SiUS371614E
245
Service Diagnosis
3.50 Inverter Radiation Fin Temperature Abnormality
Error Code
P4
Applicable
Models
All outdoor unit models
Method of Error
Detection
Detect the resistance of the following thermistors during the compressor stops running:
Radiation fin thermistor
Thermistor located in PCB circuit
Error Decision
Conditions
When the resistance of the thermistor comes to a value equivalent to open or short circuit.
Error is not decided while the unit operation is continued.
P4
will be displayed by pressing the inspection button.
Supposed
Causes
Defective radiation fin temperature thermistor
Defective inverter PCB
Defective inverter compressor
Defective fan motor
Troubleshooting
Check in Monitor Mode
8-14 ton classes are equipped
with 2 compressors.
Check for the compressor 1 or
2 applicable to the error code
P4
while in monitor mode of
the outdoor unit PCB.
Make measurement of
resistance of the radiation fin
thermistor.
Is the
resistance of the
relevant thermistor
normal?
The
insulation
resistance of the
relevant inverter compressor
is not more than
100 k
Ω
.
The insulation
resistance of the relevant
fan motor is not more
than 1 M
Ω
.
Turn ON
the power supply.
Does the error
recur?
NO
YES
NO
YES
NO
YES
YES
NO
Replace the inverter PCB. (
1)
1
REYQ72TA: A3P
REYQ96-168TA: A3P, A6P
Replace the compressor.
REYQ72TA: M1C
REYQ96-168TA: M1C, M2C
Replace the fan motor.
Replace the inverter PCB. (
1)
Continue operation.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Summary of Contents for REYQ-TA Series
Page 1: ...Service Manual SiUS371614E REYQ72 456TAYDU REYQ72 456TATJU Heat Recovery 60 Hz...
Page 304: ...Wiring Diagrams SiUS371614E 291 Appendix REYQ96 120TAYDU 2D106425A...
Page 305: ...SiUS371614E Wiring Diagrams Appendix 292 REYQ144 168TAYDU 2D106426A...
Page 306: ...Wiring Diagrams SiUS371614E 293 Appendix REYQ72TATJU 3D106421A...
Page 307: ...SiUS371614E Wiring Diagrams Appendix 294 REYQ96 120TATJU 2D106422A...
Page 308: ...Wiring Diagrams SiUS371614E 295 Appendix REYQ144 168TATJU 2D106423A...
Page 318: ...Wiring Diagrams SiUS371614E 305 Appendix VAM1200GVJU 3D073270C...
Page 320: ...Wiring Diagrams SiUS371614E 307 Appendix 1 4 2 Multi Branch Selector Unit BS4Q54TVJ 3D089123B...
Page 321: ...SiUS371614E Wiring Diagrams Appendix 308 BS6 8Q54TVJ 2D089122B...
Page 322: ...Wiring Diagrams SiUS371614E 309 Appendix BS10 12Q54TVJ 2D089121B...
Page 323: ...Revision History Month Year Version Revised contents 02 2017 SiUS371614E First edition...
