A6Daikin · VRV IV RXTQ-TA / RXTQ-TB · Heat Pump

Daikin VRV IV RXTQ-TA / RXTQ-TB error code A6

Indoor fan motor lock or overload

Needs attention soon

Also written as A6-01, A6-10, A6-11, A6-20, A6-21, fan motor, blower

Which models this applies to. Indoor unit

Quick answer

On Daikin VRV IV RXTQ-TA / RXTQ-TB, A6 is a fault. It means indoor fan motor lock or overload. A first thing to check: A locked or seized fan motor.

Applies to: Daikin VRV IV RXTQ-TA / RXTQ-TB; Daikin VRV IV RXTQ heat pump codes · Heat Pump
Type of code: Fault; Urgency: Needs attention soon
First safe check: Turn the fan wheel by hand and confirm it moves freely. A wheel that will not turn is a seized bearing or a foreign object, and it is the fastest way to separate a motor fault from a board fault.

Checked 2026-09-26

What A6 means on this model

A grouped code covering a locked fan motor, a fan overcurrent, a fan position error, a motor status error and low airflow. The sub-codes are A6-01, A6-10, A6-11, A6-20 and A6-21. For the overcurrent and position sub-codes Daikin directs you to check the connector between the fan motor and the fan board first, then the motor, then the board, in that order.

Symptoms you will notice

Indoor unit shows A6 and stops
Indoor blower is not turning or is noisy
Airflow from the indoor unit is weak or absent
The fan is stuck, or turns by hand with resistance

Common causes

The code tells you what the control detected, not which part failed. These are the causes we see most often, roughly in order of likelihood:

A locked or seized fan motor
A failed fan motor drawing excessive current
A lost position signal from the fan motor
A loose or corroded connector between the fan motor and the fan PCB
A blocked indoor coil or dirty filter restricting airflow
A failed fan PCB

What you can safely check

These are homeowner-level checks. None of them need you to open a live electrical compartment or work on gas.

Turn the fan wheel by hand and confirm it moves freely. A wheel that will not turn is a seized bearing or a foreign object, and it is the fastest way to separate a motor fault from a board fault.
Check the connector between the fan motor and the fan PCB for a backed-out pin, corrosion or damage, because the manual puts this step before both part replacements.
Check the indoor coil and filter, since a blocked coil raises fan load enough to trip the fault.

Do not do these

×Do not replace the fan PCB when the manual says to check the connector first. A6-10 and A6-11 both name the connector as step one.
×Do not force a seized fan wheel to free it with pliers. The motor bearings and the wheel are matched and forcing it makes the replacement part fit worse.
×Do not run the fan motor with the power switch on.

When to call a technician

Book a technician, do not keep resetting it

This fault will not clear on its own. Every power cycle gives the control one more failed attempt, and repeated attempts are what turn a cheap part replacement into a seized or contaminated system.

The refrigerant circuit is sealed and legally requires licensed handling. Opening it without certification releases refrigerant and can put the whole system in violation of regulation, so a low-pressure or high-pressure fault on this equipment is a call-out, not a weekend job.
If the appliance has stopped mid-cycle, is making a noise you have not heard before, or smells burnt, stop reading here and call. Those are symptoms of something the fault code does not describe well enough.

Turning the fan by hand and checking a filter are homeowner tasks. Anything electrical on the fan circuit is a technician job.

What it costs to fix

Parts

Indoor fan motor $150 to $400. Fan PCB $150 to $350. Indoor coil $250 to $600.

Labor

One to two hours for a connector or motor, more if the coil has to come out.

DIY or technician