Specifications

SiUS12-928_A Troubleshooting
Service Diagnosis 144
Troubleshooting 18 class
Check No.04
Refer to P.150
Check No.06
Refer to P.152
(R11901)
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
YES
NG
NO
OK
NG
YES
YES
NO
OK
NO
YES
NO
NO
YES
NO
YES
NO
NO
YES
YES
* Discharge pipe thermistor
* Indoor or outdoor heat exchanger thermistor
* Room temperature thermistor
* Outdoor temperature thermistor
Check for refrigerant shortage.
Change for a specified amount of
fresh refrigerant.
Replace the outdoor unit PCB.
Check No. 04
Electronic expansion valve
functioning?
Replace them in position.
CT in trouble (refer to H8).
Replace the compressor.
Repair the pipe flare or
replace the union.
Check the power transistor
harness for looseness.
Correct it as required. Also
replace the cracked pipe.
Check the pipes for
improper contact. Correct
them as required. Also
replace the cracked pipe.
Replace the electronic
expansion valve.
Replace the room
temperature thermistor,
outdoor temperature
thermistor, or the indoor or
outdoor heat exchanger
thermistor.
Completed.
Completed.
Refrigerant shortage error
again?
Oil oozing at internal
piping?
Check the CT.
Compressor vibrating
too much?
Oil oozing at relay
pipe connections?
Open the stop valve.
Stop valve closed?
Any thermistor
disconnected?
Check No. 06
Check the thermistors.
Error again?