Compressor System Sensor Abnormality - Daikin FTK Series Service Manual

Troubleshooting

4.17 Compressor System Sensor Abnormality

H0
Error Code
Method of Error
The system checks the DC current before the compressor starts.
Detection
Error Decision
 The voltage converted from the DC current before compressor start-up is out of the range
Conditions
 The DC voltage before compressor start-up is below 50 V.
Supposed
 Broken or disconnected harness
Causes  Defective outdoor unit PCB
Troubleshooting
Check the relay harness for the
compressor.
Turn off the power. Then, turn on
the power to restart the system.
77
0.5 ~ 4.5 V.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
YES
Is the harness broken?
NO
Restart operation
NO
and error displayed
again?
YES
DAMA-SM-21-001
Replace the harness.
Not a malfunction.
Keep observing.
Replace the outdoor unit
PCB (main PCB).
Service Diagnosis