Specifications

Troubleshooting SiUS12-928_A
127 Service Diagnosis
Troubleshooting
Connect properly.
(R7174)
NO
YES
Connect properly.
NO
YES
Replace the reactor.
NO
YES
Replace the compressor or
the compressor relay
harness.
Start the operation again
and if the error appears
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 each
terminals with a tester.
Caution
Between
each terminal 10Ω or
less?
Compressor connection check
Reactor check
Compressor check
Turn off the power.
Reactor connection check
Connection OK?
Connection OK?
10Ω or less?
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.