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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:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Check the CN-PSW1 connector connection:
- Turn OFF the power.
- Check the connector connection.
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 the CN-PSW1 connector
connection normal?
Is there any continuity?
- Defect in outdoor unit PCB
(main).
- Replace the outdoor unit
PCB (main).
- Defect in outdoor high
pressure switch.
- Replace the outdoor high
pressure switch.
No
Yes
Yes
No
- Connector poor contact.
- Correct the connection.
CN-EV
WHITE
ELECTRO MAGNETIC COIL
(EXPANSION VALVE)
HIGH PRESSURE
SWITCH
Multimeter
(normally close)
FG1
GREEN
G
CN-PSW1
BLUE
116
M
RR
2
Caution
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