E04Indoor
Indoor fan motor lock (model-specific)
Indoor fan motor locked or failing · Fan obstruction or seized bearing · Indoor fan-drive circuit/PCB abnormality
Panasonic Aircon Error Codes
Learn what common Panasonic error codes mean, what typically causes them, and whether they need urgent attention.
Panasonic code table
This is a guidance table, not a model-exact diagnosis. The same code can differ by series, controller, and model year. Use this page to narrow next steps, then verify with model sticker details.
Safety Warning
Stop using the unit and contact a technician if the breaker trips repeatedly, you smell burning, see sparks, hear loud electrical buzzing, or water is leaking from places it normally should not.
F11System
Cooling/heating cycle abnormality
Indoor-outdoor model/capacity mismatch · Configuration or wiring/piping setup error · Refrigeration cycle instability · Protection logic triggered to prevent hardware damage
F16Inverter
Total running current protection
Inverter IPM or power module abnormality · Compressor electrical overload or lock condition · DC bus voltage/current abnormality · Protection trip caused by sustained high load
F17System
Indoor standby units freezing abnormality
Indoor-outdoor model/capacity mismatch · Configuration or wiring/piping setup error · Refrigeration cycle instability · Protection logic triggered to prevent hardware damage
F18System
Indoor standby units overheating abnormality
Indoor-outdoor model/capacity mismatch · Configuration or wiring/piping setup error · Refrigeration cycle instability · Protection logic triggered to prevent hardware damage
F87Inverter
Control box overheating protection
Inverter IPM or power module abnormality · Compressor electrical overload or lock condition · DC bus voltage/current abnormality · Protection trip caused by sustained high load
F90Inverter
PFC protection circuit trip
PFC circuit protection triggered in outdoor inverter board · Power transistor/bridge components stressed or faulty · Voltage fluctuation or surge condition · Compressor/inverter load causing abnormal current draw
F91System
Refrigeration cycle abnormality
Refrigeration cycle abnormal due to leak or restriction · Expansion control issue affecting refrigerant flow · Compressor efficiency drop or overload · Sensor mismatch causing unstable control
F93Inverter
Compressor revolution abnormality
Inverter IPM or power module abnormality · Compressor electrical overload or lock condition · DC bus voltage/current abnormality · Protection trip caused by sustained high load
F94Outdoor
Compressor discharge pressure overshoot protection
Outdoor airflow restriction or dirty condenser coil · Outdoor fan motor/driver fault · Refrigerant pressure imbalance in circuit · Outdoor protection device triggered
F95Outdoor
Outdoor cooling high pressure protection
Outdoor cooling high-pressure protection triggered · Condenser airflow blocked or coil heavily soiled · Outdoor fan speed/fan motor issue · Refrigerant overcharge or non-condensable gas
F96Inverter
Power transistor module overheating protection
IPM/power module temperature exceeded limit · Inverter heatsink cooling degraded · High sustained compressor load · Outdoor PCB thermal management fault
F97Inverter
Compressor overheating protection
Compressor shell/discharge temperature too high · Low refrigerant or flow restriction · Compressor mechanical wear or high load · Insufficient condenser heat rejection
F98Inverter
Total running current protection
Total running current exceeded protection threshold · Compressor or fan electrical load abnormal · Power quality instability · Inverter control board fault
F99Inverter
Outdoor DC peak detection protection
Outdoor DC peak current detected by inverter protection · Compressor winding/drive abnormality · IPM/power stage stress under startup/load · Short-duration surge or fault on DC bus
H00System
No failure memory (no abnormality detected)
No active fault stored by self-diagnosis · Temporary problem cleared after restart · Intermittent issue not currently detected
H11Communication
Indoor and outdoor communication abnormality
Loose or reversed interconnection cable between indoor and outdoor units · Corroded terminals or poor wire contact · Indoor PCB or outdoor PCB communication fault · Power instability after restart or blackout
H12System
Indoor unit capacity unmatched
Indoor-outdoor model/capacity mismatch · Configuration or wiring/piping setup error · Refrigeration cycle instability · Protection logic triggered to prevent hardware damage
H14Sensor
Indoor intake air temperature sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H15Sensor
Compressor temperature sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H16Sensor
Outdoor current transformer abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H17Sensor
Outdoor intake air temperature sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H19Indoor
Indoor fan motor mechanism lock
Indoor fan motor shaft locked or winding fault · Fan wheel jammed by dirt/debris · Indoor PCB fan-drive fault · Loose fan motor harness connection
H21Indoor
Indoor float switch operation abnormality
Condensate float switch activated by water level · Drain line blockage causing overflow · Drain pump malfunction (if equipped) · Float switch or wiring fault
H23Sensor
Indoor heat exchanger temperature sensor 1 abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H24Sensor
Indoor heat exchanger temperature sensor 2 abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H25System
Indoor ion device abnormality
Indoor-outdoor model/capacity mismatch · Configuration or wiring/piping setup error · Refrigeration cycle instability · Protection logic triggered to prevent hardware damage
H26System
Minus ion generation abnormality
Indoor-outdoor model/capacity mismatch · Configuration or wiring/piping setup error · Refrigeration cycle instability · Protection logic triggered to prevent hardware damage
H27Sensor
Outdoor air temperature sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H28Sensor
Outdoor heat exchanger temperature sensor 1 abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H30Sensor
Outdoor discharge pipe temperature sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H31Sensor
Evaporator outlet pipe temperature sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H32Sensor
Outdoor heat exchanger temperature sensor 2 abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H33Communication
Indoor and outdoor misconnection abnormality
Loose or damaged interconnection cable between indoor and outdoor units · Poor terminal contact or corroded wiring joints · Indoor/outdoor PCB communication circuit fault · Power supply instability affecting data transmission
H34Sensor
Outdoor heat sink temperature sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H35System
Indoor and outdoor water adverse current abnormality
Indoor-outdoor model/capacity mismatch · Configuration or wiring/piping setup error · Refrigeration cycle instability · Protection logic triggered to prevent hardware damage
H36Sensor
Outdoor gas pipe temperature sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H37Sensor
Outdoor liquid pipe temperature sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H38System
Indoor and outdoor mismatch (brand code)
Indoor-outdoor model/capacity mismatch · Configuration or wiring/piping setup error · Refrigeration cycle instability · Protection logic triggered to prevent hardware damage
H39System
Abnormal indoor operating unit or standby units
Indoor-outdoor model/capacity mismatch · Configuration or wiring/piping setup error · Refrigeration cycle instability · Protection logic triggered to prevent hardware damage
H41System
Abnormal wiring or piping connection
Indoor-outdoor model/capacity mismatch · Configuration or wiring/piping setup error · Refrigeration cycle instability · Protection logic triggered to prevent hardware damage
H50Indoor
Ventilation fan motor locked
Indoor fan, float switch, or drain path abnormality · Indoor PCB drive or control issue · Airflow restriction from clogged filter/coil · Water level/ice protection logic triggered
H51Indoor
Ventilation fan motor locked
Indoor fan, float switch, or drain path abnormality · Indoor PCB drive or control issue · Airflow restriction from clogged filter/coil · Water level/ice protection logic triggered
H52Indoor
Left-right limit switch fixing abnormality
Indoor fan, float switch, or drain path abnormality · Indoor PCB drive or control issue · Airflow restriction from clogged filter/coil · Water level/ice protection logic triggered
H58Sensor
Indoor gas sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H59Sensor
Eco sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H64Sensor
Outdoor high pressure sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H67System
nanoe abnormality
Indoor-outdoor model/capacity mismatch · Configuration or wiring/piping setup error · Refrigeration cycle instability · Protection logic triggered to prevent hardware damage
H70Sensor
Light sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H71Inverter
DC cooling fan inside control board abnormality
Inverter IPM or power module abnormality · Compressor electrical overload or lock condition · DC bus voltage/current abnormality · Protection trip caused by sustained high load
H72Sensor
Tank temperature sensor abnormality
Thermistor or sensor open/short circuit · Loose sensor connector or harness damage · Sensor drift from heat/moisture stress · PCB sensor input channel fault
H79Communication
Wireless LAN module write error
Loose or damaged interconnection cable between indoor and outdoor units · Poor terminal contact or corroded wiring joints · Indoor/outdoor PCB communication circuit fault · Power supply instability affecting data transmission
H85Communication
Abnormal communication between indoor unit and wireless LAN module
Loose or damaged interconnection cable between indoor and outdoor units · Poor terminal contact or corroded wiring joints · Indoor/outdoor PCB communication circuit fault · Power supply instability affecting data transmission
H97Outdoor
Outdoor fan motor mechanism lock
Outdoor fan motor lock or rotor resistance · Fan driver/output fault on outdoor PCB · Obstruction at outdoor fan section · High outdoor heat load stressing fan operation
H98Outdoor
Indoor high pressure protection
Refrigerant pressure too high in cooling cycle · Outdoor coil airflow blocked or condenser dirty · Outdoor fan underperforming · Refrigerant overcharge or restriction
H99Indoor
Indoor operating unit freeze protection
Indoor evaporator temperature dropped too low (freeze risk) · Dirty indoor filter/coil reducing airflow · Low refrigerant or sensor drift · Indoor fan performance issue
P10Outdoor
Outdoor high pressure protection (model-specific)
Outdoor high-pressure condition triggered protection · Condenser airflow restriction or dirty coil · Refrigerant overcharge or system pressure imbalance
Not sure how to interpret your Panasonic code?
Share the code and your model sticker. We'll advise your next step before any work is approved.
WhatsApp us