Daikin 2MXS-N Series Service Manual page 149

SiUS121502E
Troubleshooting
Check No.01
Refer to P.166
Check No.12
Refer to P.169
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Any thermistor
disconnected?
NO
Stop valve closed?
NO
Check for refrigerant shortage.
Oil oozing at relay
pipe connections?
NO
Oil oozing at internal
piping?
NO
Check No. 12
Electronic expansion valve
functioning?
YES
Change for a specified amount of
fresh refrigerant.
Refrigerant shortage error
again?
YES
Check No. 01
Check the thermistors.
OK
Replace the outdoor unit PCB
(main PCB).
Error again?
YES
YES
∗ Discharge pipe thermistor
∗ Indoor or outdoor heat exchanger thermistor
∗ Room temperature thermistor
∗ Outdoor temperature thermistor
YES
YES
YES
Compressor vibrating
too much?
YES
NO
NO
NG
NO
Troubleshooting for Outdoor Unit
Replace the thermistor(s)
position.
Open the stop valve.
Repair the pipe flare or
replace the union.
NO
Check the pipes for
improper contact and
correct them as required.
Replace the cracked pipe.
Check the power transistor
harness for loosening.
Correct it as required. Also
replace the cracked pipe.
Replace the electronic
expansion valve.
Completed.
Replace the defective
thermistor(s).
Completed.
Replace the compressor.
(R20401)
in
137