Unit stops with F91; poor cooling or heating performance.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Refrigerant leak, Blocked capillary or expansion valve, Restricted filter drier, Incorrect refrigerant charge

Warning: Refrigerant handling must be done by licensed personnel.

Homeowner actions:

1. Clean filters and coils: Ensure indoor and outdoor coils and filters are clean to avoid misdiagnosis.
2. Observe symptoms: Note if only part of the coil gets cold/hot or if there is hissing at joints (indicates leak).

A technician must perform pressure tests, leak detection, repair, evacuation, and recharge to Panasonic specifications to clear F91.

Professional Required 5/5

Refrigerant Circuit (Leak Repair and Recharge)

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