Indoor fan motor fault: the DC fan is not reaching the speed the control asked for.
Likely causes
- Power supply well below the rated voltage
- Layer short or a broken wire in the fan motor
- Broken fan-motor lead wires
- Defective fan-motor capacitor
- Defective indoor unit PCB
Safe checks for A6
- Switch off the breaker and the outdoor disconnect. Do not spin the indoor fan or unplug its connector
- Technicianthe manual checks supply voltage, whether the fan turns by hand with power off, and the motor-connector outputs
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
A6 is an indoor fan-motor fault. The voltage checks in the service manual are not a homeowner job. Call a licensed HVAC technician.
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Parts & tools for this fix
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Run capacitor (furnace blower and AC): guide
In this code: Defective fan-motor capacitor
This one is for a technician to test or replace, so we only explain it and do not link to buy it.
Multimeter for appliance and HVAC diagnosis: guide
In this code: Power supply well below the rated voltage
This one is for a technician to test or replace, so we only explain it and do not link to buy it.