H19

Malfunction Decision Conditions

  • The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor (feedback of rotation > 2550 rpm or < 50 rpm)

Malfunction Caused

  • Operation stops due to short circuit inside the fan motor winding.
  • Operation stops due to breaking of wire inside the fan motor.
  • Operation stops due to breaking of fan motor lead wires.
  • Operation stops due to Hall IC malfunction.
  • Operation error due to faulty indoor unit PCB.

Troubleshooting

When abnormality indication starts again
↓
Turn off power supply and rotate fan by hand
⚠
Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.
↓
Does fan rotate smoothly?
NO
→
  • Replace fan motor
YES
↓
Turn power supply on and operate fan.
↓
Does it rotate?
YES
→
Stop fan motor
NO
↓
↓
If fan does NOT rotate:
Turn off power supply and disconnect fan motor connector, then turn power on.
↓
Check the output of fan motor from indoor PCB
↓
Is the motor power supply voltage ~325Vdc (pin 1 & 4) generated?
NO
NO →↓ (Go to Replace indoor PCB)
↓
Is the motor control voltage 15Vdc (pin 5 & 4) generated?
NO
NO →↓ (Go to Replace indoor PCB)
↓
Operate the fan, is the rotation command voltage 1~5Vdc (pin 6 & 4) generated?
►
NO
NO →↓ (Go to Replace indoor PCB)
YES
YES
↓
►
If fan rotates (from Stop fan motor):
Check the rotation feedback output from fan motor.
↓
Rotate the fan motor by hand, is the rotation feedback voltage 15Vdc (pin 7 & 4) generated?
NO
YES
↓
YES
↓
  • Replace indoor PCB
NO (from Rotate check) / YES (from Rotate command)
↓
  • Replace fan motor
◄
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