Panasonic WH-SDC09H3E8 Service Manual page 196

16.5.36 Outdoor High Pressure Switch Abnormal (F27)
Malfunction Decision Conditions:
During compressor stop, and outdoor high pressure switch is remain opened.
Malfunction Caused:
1 Faulty connector connection.
2 Faulty switch.
3 Faulty outdoor unit PCB (main).
Abnormality Judgment:
Continue for 1 minute.
Troubleshooting:
Check the CN-PSW1 connector connection:
- Turn OFF the power
- Check the connector connection
Is the CN-PSW1 connector
connection normal?
Check the continuity of the outdoor high
pressure switch:
- Plug out outdoor high pressure switch
connector from CN-PSW1 channel
- Measure the connector continuity
Is there any continuity?
Caution
No
- Connector poor contact
- Correct the connection
Yes
- Defect in outdoor unit PCB
Yes
(main)
- Replace the outdoor unit
PCB (main)
No
- Defect in outdoor high
pressure switch
- Replace the outdoor high
pressure switch
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
196
(normally close)
Multimeter