Compressor System Sensor Abnormality - Daikin BA-Series Service Manual

Troubleshooting

4.18 Compressor System Sensor Abnormality

H0
Error Code
Method of Error The system checks the DC current before the compressor starts.
Detection
Error Decision
Conditions
Supposed
Causes
Troubleshooting
85
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.
Broken or disconnected harness
Defective outdoor unit PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check the relay harness for the
compressor.
Is the harness broken?
NO
Turn off the power and turn it on
again.
Restart operation
and error displayed
again?
YES
YES
NO
SiBE05-722ED
Replace the harness.
No problem.
Keep on running.
Replace the outdoor unit
PCB.
(R11712)
Service Diagnosis