H6
Daikin Indoor Fan Motor Lock / Stall Detection

Daikin furnace/air handler shows H6; indoor fan may run at incorrect speed or not at all.

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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

Obstructed blower wheel, Seized ECM blower motor bearings, Loose blower wheel on shaft causing imbalance, Faulty ECM motor electronics

How to Fix / Troubleshooting

Safety: Disconnect power and wait for the blower to stop before working in the blower compartment.

Steps to check:

  • Remove obstruction: Inspect the blower wheel for insulation, plastic, or other debris. Remove any foreign objects.
  • Check wheel set screw: Ensure the blower wheel is firmly attached to the motor shaft and not slipping.
  • Spin test: Rotate the blower wheel by hand. If it feels rough or does not spin freely, the motor bearings may be failing.
  • Reset and test: Restore power and call for heat. If H6 returns quickly, the ECM motor likely needs replacement.

Because ECM motors are electronically controlled, replacement of the Daikin ECM blower motor assembly is typically required when H6 persists.

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Repair Difficulty

Hard 4/5

Required Part

Daikin ECM Blower Motor Assembly
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