Daikin B-Series Service Manual page 151

Troubleshooting
Troubleshooting
Check No.04
Refer to P.142
Check No.06
Refer to P.144
140
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Any thermistor
disconnected?
NO
Stop valve closed?
NO
Check for gas leakage.
Oil oozing at relay
pipe connections?
NO
Oil oozing at internal
piping?
NO
Check No. 04
Electronic expansion valve
functioning?
YES
Check the CT.
Functioning
Change for a specified amount of
fresh refrigerant.
Gas 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
Malfunctioning
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.
CT in trouble (refer to H8).
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
Service Diagnosis
Si04-306E
(R8525)