Panasonic WH-UD05JE5 Service Manual page 226

19.5.37 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.
CN-EV CN-PSW1
WHITE BLUE
1 6 1 2
R R
M
ELECTRO MAGNETIC COIL
(EXPANSION VALVE)
226
FG1
G
GREEN
HIGH PRESSURE
SWITCH
(normally close)
Multimeter