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17.5.48 Cooling High Pressure Overload Protection (F95)
Malfunction Decision Conditions:
During operation of cooling, when pressure 4.0 MPa and above is detected by outdoor high pressure sensor.
Malfunction Caused:
1 Dust accumulation in the outdoor unit heat exchanger.
2 Air short circuit at outdoor unit.
3 2 way valve closed.
4 Faulty outdoor unit fan motor.
5 Clogged expansion valve or strainer.
6 Excessive refrigerant.
7 Faulty outdoor high pressure sensor.
8 Faulty outdoor unit PCB (main).
Check the dust accumulation on the
outdoor unit heat exchanger.
Check the outdoor unit fan
motor operation.
Is the outdoor unit fan
motor operate normally?
Check refrigerant amount.
Is the expansion valve or
strainer clogged (ice formed)?
Is the additional refrigerant
amount filled correctly?
Check for clogged
expansion valve or strainer.
Clean the heat exchanger.
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes
No
No
No
Replace the outdoor unit
fan motor and/or outdoor
unit PCB (main).
Reclaim and recharge with
correct amount of
refrigerant.
- Replace the expansion
valve and/or strainer.
- Reclaim and recharge
refrigerant.
- Replace the outdoor unit
PCB (main).
- Replace the outdoor high
pressure sensor.
Open the 2 way valve.
Provide sufficient air
passage
Is the outdoor unit heat
exchanger dirty?
Check the outdoor air
passage.
Is there any short circuit?
Check the 2 way valve.
Is the 2 way valve closed?
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.