H99

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

When abnormality indication starts again
↓
Check the air passage
⚠
Caution 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
→
  • Provide sufficient air passage
↓
Check the indoor unit air filter
↓
Is the air filter dirty?
YES
→
  • Clean the air filter
NO
↓
Check the dust accumulation on the indoor unit heat exchanger
↓
Is the indoor unit heat exchanger dirty?
YES
→
  • Clean the indoor unit heat exchanger
NO
↓
Check if 2/3 way valve is closed?
YES
→
  • Open the 2/3 way valve.
NO
↓
Check if indoor fan motor operates normally?
NO
→
  • Replace the indoor unit fan motor and/or indoor unit PCB.
YES
↓
Check for gas leakage. Is Oil oozing out from the 2/3 way valve?
YES
→
  • Repair the pipe flare or union nuts
  • Reclaim and recharge refrigerant
↓
Check if expansion valve or strainer clogged (ice formed)?
YES
→
  • Reclaim and recharge with correct amount of refrigerant.
NO
↓
Check the indoor pipe temperature sensor
↓
Does it conform to the sensor characteristic chart?
NO
→
  • Replace the indoor pipe temperature sensor
YES
↓
YES
►
  • Replace the indoor unit PCB
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