SiBE041012_A
Troubleshooting
Service Diagnosis
102
4.17.2 50 Class
Remote
Controller
Display
H0
Method of
Malfunction
Detection
The system checks the supply voltage and the DC voltage before the compressor starts.
The system checks the compressor current right after the compressor starts.
Malfunction
Decision
Conditions
The supply voltage and the DC voltage is obviously low or high.
The compressor current does not run when the compressor starts.
Supposed
Causes
Disconnection of reactor
Disconnection of compressor harness
Defective outdoor unit PCB
Defective compressor
Troubleshooting
Connect it properly.
(R7174)
NO
YES
Connect it properly.
NO
YES
Replace the reactor.
NO
YES
Replace the compressor or
the compressor relay
harness.
Restart the operation again
and if the error occurs
again, replace the outdoor
unit PCB.
NO
YES
Disconnect the reactor from the outdoor
unit PCB and measure the resistance
value between reactor terminals with
tester.
Disconnect the compressor relay harness
from the outdoor unit PCB and measure
the resistance value between the each 3
terminals of the compressor with tester.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Between all
each terminal 10
Ω
or
less?
Check the connection of the
compressor.
Check the reactor.
Check the compressor.
Turn off the power.
Check the connection of the
reactor.
Connection OK?
Connection OK?
10
Ω
or less?
