Panasonic · Air Conditioner

Panasonic Air Conditioner F91 error code

Difficulty: Hard · Cost: $150–$500 · Duration: Requires professional service

The F91 error means your Panasonic air conditioner detected an abnormality in the refrigerant cycle. This is a serious fault that can indicate a refrigerant leak, a blockage in the refrigerant circuit, or a faulty expansion valve. Refrigerant issues must always be handled by a licensed technician as they require specialist equipment and certification.

Common causes

Refrigerant has leaked from the system reducing the charge level
Blockage in the refrigerant circuit preventing normal flow
Expansion valve has malfunctioned affecting refrigerant flow
Refrigerant circuit component has failed

How to fix it

1

Turn off the unit at the circuit breaker immediately
2

Do not attempt to use the unit — running with an abnormal refrigerant cycle can damage the compressor
3

Contact a licensed technician to inspect the refrigerant circuit and repair the fault