Daikin Heat Pump Error Code A6

The A6 code indicates that the indoor DC fan motor is not reaching its demanded rotational speed. The system monitors the actual fan RPM against the target speed, and when it detects a shortfall, it shuts down and logs the A6 fault. Common causes include power supply voltage problems, a failing fan motor, a blocked fan blade, or a wiring issue between the motor and the control board.

No. The system shuts down automatically when the A6 fault is triggered, and attempting to force continued operation is not recommended. Running the system with a non-functional or underperforming indoor fan can cause the heat exchanger to freeze or overheat depending on the operating mode, potentially causing additional component damage.

A power reset may temporarily clear the A6 code and allow the unit to restart, but if the underlying fault is still present, the error will return shortly after startup when the system again detects that the fan motor is not reaching its demanded speed. A reset alone is not a repair. The root cause must be identified and corrected to permanently resolve the fault.

Some basic checks are safe for a knowledgeable homeowner, such as visually inspecting the indoor unit for obvious obstructions around the fan and verifying the unit has stable power. However, diagnosing DC motor drive circuits, testing wiring harnesses, and replacing the fan motor or control board require familiarity with high-voltage components and should be handled by a qualified HVAC technician.

Repair costs vary depending on the root cause. If the issue is simply a wiring connector or voltage supply problem, costs may be limited to a service call fee in the range of 80 to 150 dollars. If the indoor fan motor needs replacement, parts and labor typically range from 250 to 600 dollars or more depending on the specific unit model and local labor rates. A control board replacement can bring costs higher still.