Error code reference
Panasonic Air Conditioner Error Code F91
Refrigeration cycle abnormality
Refrigeration cycle abnormality — input current is low while compressor is running at higher than setting frequency (2 times within 20 minutes).
First step from the service manual
Check if 3-way valve is open.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
MyPros+ Max
Get the full diagnostic procedure for F91.
- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
Get the full procedure
$29/month · Cancel anytime · Or $9.95 3-day pass
78,000+ service manuals · 160,000+ error codes · 55+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass