Panasonic WH-MHF09G3E5 Service Manual page 93

16.5.9 Outdoor High Pressure Abnormality (H64)
Malfunction Decision Conditions:
During operation of heating, when the outdoor high pressure sensor output signal is 0Vdc or 5Vdc.
Malfunction Caused:
1 Faulty connector connection.
2 Faulty sensor.
3 Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue 4 times in 20 minutes.
Troubleshooting:
Check the CN-HPS connector connection:
- Turn OFF the power.
- Check the connector connection.
Is the CN-HPS connector
connection normal?
Yes
Check the continuity of the outdoor unit PCB (main)
high pressure sensor connector CN-HPS:
- Plug out connector from the outdoor unit PCB (main).
- Measure the continuity pin 1 & 3 (GND) and pin 1 &
4 (5 V) of CN-HPS.
Is there any continuity?
No
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
No
- Connector poor contact.
- Correct the connection.
- Defect in outdoor unit
Yes
PCB (main).
- Replace the outdoor
unit PCB (main).
Reconnect the high pressure sensor
connector to the outdoor unit PCB
(main). Turn ON the power and run
the system. Measure the DC voltage
pin 1 & 3 (G ND) of CN-HPS.
Is the measured voltage
0 Vdc or 5 Vdc?
Yes
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- Defect in outdoor unit
No
PCB (main).
- Replace the outdoor
unit PCB (main).
- Defect in outdoor high
pressure sensor.
- Replace the outdoor
high pressure sensor.