F91
Panasonic F91 Error Code – Refrigeration Cycle Abnormality
Air Conditioner · CRITICAL Severity
What This Error Means
Refrigeration cycle abnormality (2 times within 20 min)
Diagnostic & Repair Steps
1
Power Off Immediately
Refrigeration cycle fault is critical.
Refrigeration cycle fault is critical.
RESET
~2 min
2
Check for Refrigerant Leak
Use leak detector on all joints. ⚠️ Certified technician only
Use leak detector on all joints. ⚠️ Certified technician only
TEST
~20 min
3
Verify 3-Way Service Valve is Open
Confirm both service valves are fully open.
Confirm both service valves are fully open.
CHECK
~5 min
4
Check Refrigerant Charge
Measure system pressures. ⚠️ Certified technician only
Measure system pressures. ⚠️ Certified technician only
TEST
~20 min
5
Contact Panasonic Support
If refrigerant system OK but error persists.
If refrigerant system OK but error persists.
CHECK
~5 min
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