Panasonic Air Conditioner
Panasonic AC F91 error
Low gas / refrigerant leak or blockage
Try a reset once. If it comes back, a trained technician should repair it.
What it means
The system has detected too little refrigerant flow — usually a gas leak or a blockage in the pipes.
Common causes
- Gas leak at a joint, coil or pipe
- Blocked capillary or expansion valve
- Service valves not fully opened after installation
Try this at home first
Tick each step as you go
When to call a technician
Call a technician to find and fix the leak before refilling gas. Refilling without fixing the leak only wastes money.
Safety first
Always switch off at the wall socket or MCB before touching any part. Do not open the outdoor unit, control boards or gas pipes yourself — they carry high voltage and pressure.
Frequently asked questions
What does F91 mean on a Panasonic Air Conditioner?
Low gas / refrigerant leak or blockage. The system has detected too little refrigerant flow — usually a gas leak or a blockage in the pipes.
Can I fix Panasonic Air Conditioner error F91 myself?
You can try a reset first: Switch the AC off — running it short of gas can damage the compressor. If the code returns, call a technician.
Is it safe to keep using the Air Conditioner with F91?
Avoid repeated restarts; running with this fault can cause more damage.
Other Panasonic AC codes
Sources
We write every explanation in our own words from these references.
- Panasonic — Air conditioner error codes: using the self-diagnosis function
- Panasonic Philippines — Identify air conditioner issues: the self-diagnosis function
Last checked: 2026-10-20