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56
12.4.20 H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry)
Error Code will not display (no Timer LED blinking) but store in EEPROM
Malfunction Decision Conditions
Freeze prevention control takes place (when indoor pipe temperature is lower than 2°C).
Malfunction Caused
Air short circuit at indoor unit.
Clogged indoor unit air filter.
Dust accumulation on the indoor unit heat exchanger.
2/3 way valve closed.
Faulty indoor unit fan motor.
Refrigerant shortage (refrigerant leakage).
Clogged expansion valve or strainer.
Faulty indoor pipe temperature sensor.
Faulty indoor unit PCB.
Troubleshooting
Check the air passage.
When abnormality indication starts again.
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Is there any short circuit?
YES
YES
YES
YES
YES
YES
YES
NO
NO
Check the indoor unit air filter.
Is the air filter dirty?
Is the indoor unit heat exchanger dirty?
Check if 2/3 way valve is closed?
Check if indoor fan motor operates normally?
Check if expansion valve or strainer clogged (ice formed)?
Does it conform to the sensor characteristic chart?
Check the indoor pipe temperature sensor.
Check the dust accumulation on the indoor unit heat
exchanger.
Check for gas leakage, Is oil oozing out from the 2/3 way
valve?
● Provide sufficient air passage.
● Clean the air filter.
● Clean the indoor unit heat exchanger.
● Open the 2/3 way valve.
● Replace the indoor unit PCB.
● Replace the indoor pipe temperature
sensor.
● Reclaim and recharge with correct
amount of refrigerant.
● Replace the indoor unit fan motor and/or
indoor unit PCB.
● Repair the pipe flare or union nuts.
● Reclaim and recharge refrigerant.
NO
NO
NO
NO
YES
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