Panasonic U-4LE1R8 Service Manual page 72

3. Mini VRF System Alarm Codes
H02 PAM Error
1. Error Detection Method
• Error is detected by over-voltage and overcurrent of DC side.
2. Error Diagnosis
1 Power
1-1
supply*
1-2
1-3
2 Control PC
2-1
board wiring
2-2
2-3
*
Check not only in the outdoor unit stop mode but in the drive mode.
3
Not satisfied with + 10% rated supply voltage
Extreme voltage fluctuations
Extreme distortion of voltage waveform
Loose electrical wire connection
Is HIC control PC board connector (CN-PAM) poorly connected or
opened with wire?
Replace HIC control PC board.
3-32
Mini VRF SYSTEM
Trouble Diagnosis
Yes Check power supply
No 1-2
Yes Check power supply
No 1-3
Yes Check power supply
No 2-1
Yes Correct connection
No 2-2
Correct connection
Yes
or wiring
No 2-3