Panasonic WH-UD09HE8 - Page 184

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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).
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
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Caution