Daikin FTXS09HVJU Service Manual page 150

Troubleshooting
Troubleshooting
Check No.04
Refer to P.144
Check No.06
Refer to P.146
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts damage may occur.
Any thermistor
disconnected?
NO
Stop valve
closed?
NO
Check for refrigerant leakage.
Oil oozing at
relay pipe connections?
NO
Oil oozing at
internal piping?
NO
Check No. 04
Electronic expansion valve
functioning?
YES
Change for a specified amount of
fresh refrigerant.
Refrigerant
shortage error again?
NO
YES
* Discharge pipe thermistor
* Indoor / outdoor unit heat exchanger thermistor
* Room temperature thermistor
* Outdoor air thermistor
YES
YES
YES
Compressor
vibrating too much?
NO
NO
YES
Check No. 06
Check the thermistors.
Functioning
Replace in position.
Open the stop valve.
Repair the pipe flare or
replace the square union.
YES
Check the power transistor
harness for looseness.
Correct it as required. Also
replace cracked pipe if any.
Check the pipes for
improper contact. Correct as
required. Also replace
cracked pipe if any.
Replace the electronic
expansion valve.
Replace the room
Malfunctioning
temperature or outdoor air
thermistor, or the indoor unit
or outdoor unit heat
exchanger thermistor.
(1) Replace the PCB.
(2) Replace the compressor
Procedure complete
SiUS04-904
(R7149)
139