C5
Daikin Indoor Fan Motor Lock / Overload Detection

Indoor unit shows C5; fan operation may be abnormal

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Fan motor rotor locked by debris, Failed fan motor hall sensor, Faulty fan motor drive circuit, Excessive dust on blower wheel

How to Fix / Troubleshooting

Safety first: Disconnect power before accessing the fan.

Steps:

  • Remove the front panel and filters; visually inspect the blower wheel for heavy dust or foreign objects.
  • Spin the blower by hand; if stiff or jammed, clean thoroughly and remove obstructions.

Technician tasks:

  • Check fan motor hall sensor signals at the PCB.
  • Replace the indoor fan motor if it remains locked or hall sensor is faulty.
  • If the motor is good, replace the indoor PCB fan drive section.
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Repair Difficulty

Hard 4/5

Required Part

Indoor Fan Motor
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