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65
15.2.13 H99 (Indoor Operating Unit Freeze Protection)
Malfunction Decision Conditions
During cooling operation, anti-freezing control take place when indoor pipe temperature is lower than 0°C.
Malfunction Caused
Clogged air filter of the indoor unit.
Dust accumulation on the indoor unit heat exchanger.
Air short circuit.
Detection error due to faulty indoor pipe temperature sensor.
Detection error due to faulty indoor unit PCB.
Troubleshooting
Check the air filter.
Clean the air filter.
Yes
For safety reason and to prevent component
breakdown, always switch off the power before
remove and connect the component.
Is the air filter dirty?
Check the dust accumulation on
the indoor unit heat exchanger.
Is the indoor unit heat
exchanger dirty?
No
Check the air passage.
Provide sufficient air
passage.
Yes
Is there any short circuit?
No
Check the indoor pipe
temperature sensor.
Replace the indoor unit
PCB.
Yes
Does it conform to the
sensor characteristic chart?
No
Clean the heat exchanger.
Yes
No
Replace the indoor pipe
temperature sensor.
Caution
Summary of Contents for CU-5E36QBU-5
Page 26: ...26 3 Dimensions ...
Page 27: ...27 4 Refrigeration Cycle Diagram ...
Page 28: ...28 5 Block Diagram ...
Page 30: ...30 7 Electronic Circuit Diagram ...
Page 31: ...31 8 Printed Circuit Board 8 1 Main Printed Circuit Board ...
Page 32: ...32 8 2 Noise Filter Printed Circuit Board 8 3 Display Printed Circuit Board ...
Page 33: ...33 9 Installation Information 9 1 Check Points ...
Page 50: ...50 ...
Page 51: ...51 ...