Daikin A6 Error Code

What does Daikin A6 mean?

The A6 code means the indoor fan motor has drawn overcurrent, stalled, or reported a feedback mismatch to the indoor PCB. Daikin's PCB monitors Hall-sensor feedback on DC fan motors and commanded-versus-actual speed on AC motors. When the fan cannot reach target RPM, or the windings draw more current than the trip threshold, the unit locks out to protect the motor and driver. Physical obstruction, bearing wear, and harness faults dominate root causes.

Symptoms

• Indoor fan will not spin, or spins briefly and stops
• A6 appears within seconds of a start command
• Audible grinding, rubbing, or squealing from the fan assembly
• Unit runs for several minutes then trips on thermal overload
• Fan blade visibly obstructed by debris or a slipped blower wheel

Common causes

• Defective indoor fan motor (bearings, windings, or Hall sensor)
• Obstruction in the fan scroll — leaves, insulation, or loose fasteners
• Disconnected or damaged fan-motor harness
• Defective indoor PCB fan-driver output
• Blower wheel loose on the shaft or out of balance

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Diagnostic steps

1. Power down and spin the fan by hand

   Isolate the unit, open the service panel, and rotate the fan blade. It should spin freely with no grinding or rubbing.

2. Remove obstructions from the scroll

   Clear any debris wedged between the blade and housing. Check that insulation has not delaminated into the airstream.

3. Inspect the motor harness

   Unplug the fan-motor connector at the PCB, check for burn marks, and verify pins are tight. Reseat and clip the plug.

4. Measure motor winding resistance

   On an AC motor, check winding-to-winding with a multimeter against service-manual values. An open or shorted winding means motor replacement.

5. Verify PCB fan output

   With the motor disconnected, attempt a start and probe the PCB fan-output pins for the expected drive signal. No signal indicates a defective PCB.

6. Replace the fan motor or PCB

   Swap the component that fails the above tests. Torque the blower wheel set-screw to spec and confirm the shaft key is seated.

When to call a professional

Call a licensed technician if the fan motor tests bad on a high-wall cassette or ducted unit where the assembly requires dismounting from the ceiling. DC-inverter fan motors carry matched drivers and require model-specific replacement parts. If the blower wheel is warped or the shaft is bent, you need a pro to rebalance and confirm duct static pressure on restart. Live-voltage testing inside the PCB enclosure is an arc-flash risk for untrained hands.