Daikin AT12BV1LS Pocket Manual page 80

Si10-417
5.2.27 Position Sensor Abnormality
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Service Diagnosis
H6
A compressor startup failure is detected by checking the
compressor running condition through the position
detection circuit.
The compressor fails to start in about 15 seconds
after the compressor run command signal is sent.
Clearing condition: Continuous run for about 5
minutes (normal)
The system will be shut down if the error occurs 16
times.
Compressor relay cable disconnected
Compressor itself defective
Outdoor unit PCB defective
Stop valve closed
Input voltage out of specification
Troubleshooting
79