Service Manual

Troubleshooting SiUS091133
125 Service Diagnosis
4.19 Compressor System Sensor Abnormality
4.19.1 09/12/15/18 Class
Remote
Controller
Display
H0
Method of
Malfunction
Detection
 The system checks the DC current before the compressor starts.
Malfunction
Decision
Conditions
 The DC current before compressor start-up is out of the range 0.5 ~ 4.5 V (sensor output
converted to voltage value)
 The DC voltage before compressor start-up is below 50 V.
Supposed
Causes
 Broken or disconnected harness
 Defective outdoor unit PCB
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NO
(R11712)
YES
Turn off the power and turn it on
again.
YES
NO
Replace the harness.
Replace the outdoor unit
PCB.
Is the harness broken?
Restart operation
and error displayed
again?
Check the relay harness for the
compressor.
No problem.
Keep on running.