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.

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E04Indoor

Indoor fan motor lock (model-specific)

Indoor fan motor locked or failing · Fan obstruction or seized bearing · Indoor fan-drive circuit/PCB abnormality

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 symptom 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

H85Communication

Abnormal communication between indoor unit and wireless LAN module

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

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Other diagnostic tools

If your unit shows a different symptom or a blinking pattern instead, try a different starting point.

Blinking lights

LED blinking in a pattern? Match it to the likely fault.

Aircon problems

Diagnose a specific symptom like no cooling, water leak, or noise.

Panasonic brand hub

Guides, resources, and model info for Panasonic aircon.

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