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15.2.19 F94 (Compressor Discharge Pressure Overshoot Protection)
Malfunction Decision Conditions
During operation of cooling and heating, when the outdoor unit high pressure switch is open (4.15MPa and
above).
Malfunction Caused
Clogged air filter of indoor unit.
Dust accumulation on the indoor/outdoor unit heat exchanger.
Air short circuit at indoor/outdoor unit.
3 way valve closed.
Faulty outdoor unit fan motor.
Excess
refrigerant.
Clogged expansion valve or strainer.
Faulty outdoor unit high pressure switch.
Faulty outdoor unit PCB (main).
Abnormality Judgment:
4 times happen within 30 minutes.
Troubleshooting
Yes
No
No
Check the indoor air filter or dust
accumulation on the
indoor/outdoor unit heat exchanger.
Is the indoor filter or indoor/outdoor
unit heat exchanger dirty?
Check the indoor/outdoor
air passage.
Provide sufficient air
passage.
Yes
Is there any short circuit?
No
No
Yes
Clean the indoor air filter
or heat exchanger.
Yes
No
Check refrigerant amount.
Is the additional refrigerant
amount filled correctly?
Check for clogged
expansion valve or strainer.
Is the expansion valve or
strainer clogged (ice formed)?
- Replace the expansion
valve and/or strainer
-
Reclaim and recharge
refrigerant
Yes
Is the gauge pressure
> 4.15MPa?
Get restarted and measure
the gauge pressure.
Replace the outdoor unit
PCB (main).
Yes
Reclaim and recharge for a specified
amount of fresh refrigerant.
-
Replace the outdoor unit
PCB (main)
-
Replace the outdoor unit
high pressure switch
Yes
No
Is abnormality happened
again?
Procedure complete
Is the 3 way valve closed?
Open the 3 way valve.
Check the 3 way valve.
Yes
No
Is the outdoor unit fan
motor operate normally?
Replace the outdoor unit
fan motor and/or outdoor
unit PCB (main).
Check the outdoor unit
fan motor operation.
No
Reclaim and recharge with
correct amount of refrigerant.
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Caution
Содержание CU-5E36QBU-5
Страница 26: ...26 3 Dimensions ...
Страница 27: ...27 4 Refrigeration Cycle Diagram ...
Страница 28: ...28 5 Block Diagram ...
Страница 30: ...30 7 Electronic Circuit Diagram ...
Страница 31: ...31 8 Printed Circuit Board 8 1 Main Printed Circuit Board ...
Страница 32: ...32 8 2 Noise Filter Printed Circuit Board 8 3 Display Printed Circuit Board ...
Страница 33: ...33 9 Installation Information 9 1 Check Points ...
Страница 50: ...50 ...
Страница 51: ...51 ...