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13.4.16 H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry)
Malfunction Decision Conditions
Freeze prevention control takes place (when indoor pipe temperature is lower than 2°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
When abnormality indication starts again.
Check the air passage.
Is there any short circuit?
Is the air filter dirty?
Is the indoor unit heat exchanger dirty?
Does it conform to the sensor characteristic chart?
Check the dust accumulation on the indoor unit heat
exchanger.
Check the indoor heat exchanger temperature
sensor.
Check the air filter.
YES
YES
YES
YES
NO
NO
NO
NO
Provide sufficient air passage.
Clean the air filter.
Replace the indoor unit PCB.
Replace the indoor unit PCB.
Defect in indoor unit PCB.
Clean the indoor unit heat
exchanger.
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Caution