MXS Service Manual

SiUS121736EA Troubleshooting for Outdoor Unit
Service Diagnosis 180
Troubleshooting
Check No.01
Refer to P.209
Check No.12
Refer to P.212
(R23654)
Caution
YES
NG
NO
NO
YES
YES
YES
NO
YES
NO
NO
YES
NO
∗ 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.
NO
Check No. 12
Electronic expansion valve
functioning?
Replace the electronic
expansion valve.
YES
Reconnect the thermistor(s).
Open the stop valve.
Repair the pipe flare or
replace the union.
Check if any harnesses are
in contact with the piping
and correct as required.
Also, replace any cracked
pipes.
Check the connection of the
power transistor harness.
Also, replace any cracked
pipes.
Replace the defective
thermistor(s).
Completed.
Refrigerant shortage error
again?
Oil leak at internal
piping?
Stop valve closed?
Compressor vibrating
too much?
Oil leak at relay pipe
connections?
Any thermistor
disconnected?
Check No. 01
Check the thermistors.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
OK
NO
YES
Replace the outdoor unit PCB
(main PCB).
Replace the compressor.
Completed.
Error again?
(R23654)
Caution
YES
NG
NO
NO
YES
YES
YES
NO
YES
NO
NO
YES
NO
∗ 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.
NO
Check No. 12
Electronic expansion valve
functioning?
Replace the electronic
expansion valve.
YES
Reconnect the thermistor(s).
Open the stop valve.
Repair the pipe flare or
replace the union.
Check if any harnesses are
in contact with the piping
and correct as required.
Also, replace any cracked
pipes.
Check the connection of the
power transistor harness.
Also, replace any cracked
pipes.
Replace the defective
thermistor(s).
Completed.
Refrigerant shortage error
again?
Oil leak at internal
piping?
Stop valve closed?
Compressor vibrating
too much?
Oil leak at relay pipe
connections?
Any thermistor
disconnected?
Check No. 01
Check the thermistors.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
OK
NO
YES
Replace the outdoor unit PCB
(main PCB).
Replace the compressor.
Completed.
Error again?