A6
Daikin Split AC
Severity: ModerateWhat Does This Error Mean?
Daikin A6 means the indoor fan motor reported a fault — typically wrong RPM compared to commanded, no rotation when commanded, or a sensor signal that does not match expected.
Cause is usually the fan blade jammed by debris, a worn motor bearing, or a wiring issue at the motor connector.
The unit stops to protect the motor from burning out under stall conditions.
Affected Models
- Daikin FTXB series
- Daikin FTXM series
- Daikin FTXG series
- Daikin Quaternity FTXR
- Daikin VRV indoor units
Common Causes
- Fan blade obstructed by leaves or pet hair
- Bearing failure — fan grinds when spun by hand
- Wiring connector at the motor loose or corroded
- Hall sensor inside the motor failed
- Indoor PCB fan-driver section failed
- Recent service work where the fan was reassembled incorrectly
How to Fix It
-
Power off at the breaker.
Switch off the indoor unit breaker.
Wait 5 minutes for capacitors to discharge.
Daikin BLDC fan circuits hold lethal voltage briefly after shutdown — do not work hot. -
Open the indoor head.
Lift the front grill.
Remove the air filters.
The fan is the long horizontal cylinder behind the filters.
Look for visible obstructions. -
Spin the fan by hand.
With power off, rotate the fan blade gently.
It should spin freely with light resistance.
Stiff or grinding = bearing failure.
Visible obstruction = clear it before powering back on. -
Inspect the motor connector.
Trace the wiring harness from the fan motor to the indoor PCB.
Disconnect the connector, blow out dust, reseat firmly.
Many A6 codes are simply a vibration-loose connector after years of operation. -
Clean dust from the bearing.
If the fan spins but is stiff, dust packed into the bearing area is the usual cause.
Vacuum the area with a soft brush attachment.
Avoid compressed air that drives dust deeper. -
Test motor windings.
Disconnect the motor harness at the PCB.
Measure resistance across motor coil terminals per the Daikin service manual for your model — exact values vary.
Out-of-range readings = motor failed. -
Replace the fan motor.
Daikin BLDC fan motors are 80-220 USD depending on model.
This is a job for someone comfortable opening an indoor head — multiple screws, harness routing, and the fan blade balance must be correct.
An HVAC tech is 100-200 USD labour.
Frequently Asked Questions
Why does the fan stop spinning suddenly?
BLDC fans have hall sensors that detect rotor position.
If a sensor fails, the motor cannot start — it would just stutter and stall.
The PCB detects this and posts A6 immediately rather than continuing to drive a stalled motor.