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16.5.24 Unspecified Voltage between Indoor and Outdoor (H95)
Malfunction Decision Conditions:
The supply power is detected for its requirement by the indoor/outdoor transmission.
Malfunction Caused:
1 Insufficient power supply.
2 Faulty outdoor unit PCB (noise filter/main).
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Check the supply voltage
Correct the power
supply.
No
Supply voltage as specified?
Yes
- Defect in outdoor unit
PCB (main)
- Replace the outdoor unit
PCB (main)
Check the AC voltage from outdoor unit PCB (noise filter):
- Turn OFF the power
- Plug out connector AC-BLK, CN-BLK & CN-WHT from
the outdoor unit PCB (noise filter)
- Turn ON the power
- Measure the AC voltage between AC-BLK & CN-WHT
Is the measured AC voltage
230V?
Check the AC voltage supply to outdoor unit PCB (main):
- Turn OFF the power
- Reconnect connector AC-BLK, CN-BLK & CN-WHT to
the outdoor unit PCB (noise filter)
- Turn ON the power
- Measure the AC voltage between AC-BLK & CN-WHT
Is the measured AC voltage
230V?
- Defect in outdoor
unit PCB (noise filter)
- Replace the outdoor
unit PCB (noise filter)
No
No
Is the measured voltage
between DCP & DCN ~325Vdc?
Check the rectification voltage
between DCP & DCN.
Check the DC filter (capacitor)
PCB connector connection.
Is the DC filter (capacitor) PCB
connector connection normal?
- Connector poor contact
- Correct the connection
No
Yes
Yes
No
Yes
- Defect in outdoor unit
PCB (main)
- Replace the outdoor unit
PCB (main)
- Defect in outdoor unit
PCB (main)
- Replace the outdoor unit
PCB (main)
Yes