H11

Malfunction Decision Conditions

  • During startup and operation of cooling and heating, the data received from outdoor unit in indoor unit signal transmission is checked whether it is normal.

Malfunction Caused

  • Faulty indoor unit PCB.
  • Faulty outdoor unit PCB.
  • Indoor unit-outdoor unit signal transmission error due to wiring error.
  • Indoor unit-outdoor unit signal transmission error due to breaking of wire in the connection wires between the indoor and outdoor units.

Troubleshooting

When abnormality indication starts again
↓
Measure the AC voltage at terminal 1 & 2 of outdoor unit terminal board
⚠
Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.
↓
Is the measured voltage 230/240V?
NO
→
  • AC power supply abnormal fluctuation
YES
↓
Measure the DC voltage at terminal 2 & 3 (communication terminals) of outdoor unit terminal board
↓
Is the measured DC voltage fluctuate between 10~70V?
(Value depend on multimeter accuracy)
NO
→
  • Defect in communication circuitry of outdoor unit PCB
  • Replace the PCB
YES
↓
Measure the AC voltage at terminal 1 & 2 of indoor unit terminal board
↓
Is the measured voltage 230/240V?
NO
→
  • Improper connection at terminals indoor/outdoor
  • Check indoor/outdoor connecting cable
YES
↓
Measure the DC voltage at terminal 2 & 3 of indoor unit terminal board
↓
Is the measured DC voltage fluctuate between 10~70V?
NO
→
  • Improper connection at terminals indoor/outdoor
  • Check indoor/outdoor connecting cable
YES
YES
↓
→
  • Defect in receiver/transmitter module of the communication circuitry in indoor unit PCB
  • Replace the indoor unit PCB
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