Panasonic Air Conditioner Error Codes

Troubleshooting and Error Codes for Panasonic Air Conditioners

We have listed some common error codes and issues that occur with Panasonic air conditioners.

General Panasonic Air Conditioner Error Codes

Error Code	Description	Troubleshooting Steps
H11	Indoor / Outdoor abnormal communication	Either the control cards are not working properly, or there is no connection between the internal and external modules. If this fault surfaced right away following the installation of the air conditioner, there were mistakes in the main line. Somewhere along a cliff, maybe. You can do diagnostics by making sure that every connection is appropriate for the boards; it’s conceivable that there is bad contact anywhere along the line. It’s time to replace the board if the issue started to occur after the air conditioner had been operating for a few years. It is imperative to determine whether board—the exterior or internal unit—failed. The indoor unit fan may keep running in the event of an error.
H12	Other Power Error Between Outdoor Unit and Indoor Unit	The total power of the internal modules does not match the power of the external. Such an error appears only in multi-splits. The signal appears 1.5 minutes after switching on. There can be 3 options: Incorrectly calculated cooling capacity of indoor units. The number of internal modules is incorrectly selected – the external unit cannot cope; 3. Error H11 appeared on one of the blocks, then H12 appeared on the other (the wrong number of internal modules).
H14	Room Temperature Sensor Error	The air sensor isn’t working properly; it records room temperatures that are either +46ºC or -56ºC. This indicates a short circuit in the sensor or a break in the circuit.
H15	Compressor Discharge Temperature Sensor Error	Issues with the temperature sensor of the compressor. The same issues as with the temperature sensor were present: either a short circuit or a circuit break happened.
H16	Compressor Load Current is Too Low	The external module detects low current consumption. Here are 3 reasons why a drop in consumption can happen: not enough freon (low pressure); current transformer defect (it is necessary to solder or replace the board); failure of the power IPM module.
H17	Similar to H14	Comparable to H14, but pertaining to the exterior unit: a malfunction of the compressor’s suction pipe’s temperature sensor. On the sensor, there has either been an open circuit or a short circuit.
H19	Motor mechanism of indoor fan locked	When the internal module motor’s real speed deviates from the speed that the processor specified, an error message appears, signalling that the module motor is jammed. Here are some reasons for these errors: Problems directly with the motor of the indoor unit The connectors of the wires of the engine of the indoor unit were loosened Problems with the internal module board.
H21	Drainage blocked or float sensor defective	The indoor unit’s drain pan float was having issues. The sensor is open when there is a signal. It is necessary to examine the sensor logic and measure the resistance on the pump’s motor windings, which ought to be around 200 ohms. Additionally, drainage may block; therefore, cleansing the drainage system is necessary.
H23	Indoor heat exchanger temperature sensor abnormality	Issues with the heat exchanger’s base sensor No. 1 for surface temperature in the interior unit. When the temperature of the heat exchanger falls below -40º or rises over +80ºC, the CPU identifies this anomaly. You must check for either a short circuit on the sensor or an open in the circuit.
H25	Defective ionization unit or internal board	The ionization unit is having issues. When the E-Ion is off, the port is on. The internal module board or the E-Ion board might be having issues.
H27	Outdoor intake air temperature sensor abnormality	The air temperature sensor is having issues. The processor logs the outside temperature when it is higher than +150ºC or lower than -40º. An open circuit or a short circuit on the sensor might be the root of the problem.
H28	Outdoor heat exchanger temperature sensor abnormality	Issues with the outside unit’s heat exchanger’s sensor No. 1 measuring surface temperature. The heat exchanger’s surface temperature is fixed by the processor at +110ºC or -60ºΡ. Either an open circuit in the circuit or a short circuit in the sensor is the source of the issue.
H30	Outdoor discharge air temperature sensor abnormality	Issues with the compressor’s discharge pipe’s temperature sensor. Temperature measurements over +200ºC or below -16ºΡ are recorded by the processor. When the condensation temperature is six degrees greater than the discharge temperature, an open in the temperature sensor’s circuit is identified. A short circuit or open circuit on the sensor might be the source.
H33	Indoor / Outdoor wrong connection	When there is a voltage imbalance in the data transmission line between the internal and external modules, an interconnect problem manifests itself. The interior and or outdoor units’ electrical lines are having issues.
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H34	Outdoor heat sink temperature sensor abnormality	The temperature sensor that is mounted in the power module’s radiator has malfunctioned. The processor measures the temperature difference between the external unit’s heat exchanger plates at +80ºC and -43ºC. Either the circuit was open, or the sensor had a short circuit.
H36	outdoor unit gas tube temperature sensor closed / torn off	When the external module was in the heat mode, there were issues with the temperature sensor in the gas tube. The temperature over + 149ºC or below -45ºC is recorded by the processor. Inspect the sensor or circuit for any short circuits.
H37	Outdoor unit liquid tube temperature sensor short-circuited	There were issues with the outdoor unit’s liquid tube temperature sensor when it was in the cold setting. On the sensor, there has either been an open circuit or a short circuit.
H38	Mismatch between outdoor and outdoor units	Inconsistency between brand codes of indoor unit and external.
H39	Abnormal indoor operating unit or standby units	The indoor unit is in standby mode and has frozen. arises as a result of an unusual unit evaporator temperature. All blocks show this signal at the same time, with the exception of the block where the evaporator is freezing. On the final block, an error number F17 is shown.
H41	Incorrect wiring and freon wiring	Inconsistency in the connection of wires and freon conduits
H50	Defective fan motor or board	Faulty fan motor or issues with the module board inside.
H64	Malfunction of the high pressure sensor	The high pressure sensor that is mounted in the outside unit isn’t working properly. When the compressor is turned off, the high pressure sensor stays open for a minute. Possible causes of the failure include damage to the sensor itself, broken wires, or issues with the board’s connections.
H94	Compressor discharge temperature sensor malfunction	Check compressor discharge temperature sensor connection.
H97	Faulty compressor motor, indoor unit board	The external unit’s engine gets stuck because it runs faster than the CPU has programmed it to. Reasons for these failures – Damage to the motor of the external unit Breakdown of the internal module board Problems with the connectors of the wires
H98	Protection for total current consumption	The internal module’s defense against high pressure or overheating when in heat mode has been effective. Protection kicks in when the heat exchanger in the interior module reaches + 52 °C, and the compressor shuts off entirely when the temperature reaches + 65 °C. When the temperature lowers, the compressor resumes.
H99	Error of the DC protection system	Possible causes are jamming of the compressor, failure of the transistor module, malfunction of the current sensor of the board of the external unit, the resistance of the compressor windings is below normal.
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F11	Incorrect operation of the four-way valve	This error suggests that the 4-way valve in charge of the heat/cold switching is not operating correctly. Its mechanism or the electromagnetic valve coil may be defective.
F17	Freezing of the indoor unit	Freezing of the indoor unit in standby mode, an error appears on the unit on which the fact of freezing is detected
F90	Open circuit of compressor windings	The signal appears when – When the compressor windings break (each winding under normal conditions should have a resistance of about one Ohm); If there is a difference in the resistance of the windings; If a malfunction occurs in the inverter circuit of the outdoor unit board. To eliminate the malfunction, measure the resistance and voltage.
F91	Incorrect operation of the refrigeration circuit	The error indicates that the low pressure protection in the refrigeration circuit is activated or that it is operating incorrectly.
F93	Open compressor windings, inverter board malfunction	The signal shows a discrepancy between the controller control signals and the compressor’s actual performance. Stated differently, when its velocity deviates from the controller’s control signals. Here, the system shuts off.
F94	Overpressure protection	Excessively high discharge pressure initiates protection. The refrigeration circuit’s functionality must be examined.
F95	Outdoor unit heat exchanger overheating	The external module is shielded from high pressure when it is in cooling mode. The outside unit’s heat exchanger may overheat, posing a risk to the refrigeration circuit.
F96	Overheating of the power module	The compressor thermotable in the multi systems opens upon detection of the power module overheating.
F97	High compressor discharge temperature	The compressor overheats due to its set high discharge temperature. After 20 minutes of uptime, the problem could reset itself. Frequent shutdowns of the external module without obvious cause are one indicator of a problem.
F98	Protection for total current consumption	The total current used protection has tripped. In the running mode, an excessively high current consumption of the external module is observed. One must look for the source of the problem, which might be either the outdoor unit’s heat exchanger or the refrigeration circuit. When the air conditioner is turned on or is in use, a significant drop in the power supply’s voltage may indicate a problem.
F99	Error of the DC protection system	Possible causes are jamming of the compressor, failure of the transistor module, malfunction of the current sensor of the board of the external unit, the resistance of the compressor windings is below normal.

How To Videos

Air Conditioner Breakdowns and Repairs Mackay

These are the most common error codes and descriptions for Panasonic air conditioners.

Panasonic Inverter Split Type Error Codes

Error Code	Description
S01	Room temperature sensor failure
S02	Indoor coil sensor failure
S03	Humidity sensor failure
S04	Comp. temperature sensor failure
S05	Outdoor coil sensor failure
S06	Outdoor air sensor failure
S07	Outdoor current sensor failure
E01	Indoor/outdoor communication failure
E02	HIC circuit failure (Compressor/Fan circuit)
E03	Outdoor unit OTP rom failure
E04	Peak current cut off
E05	PAM or Active circuit failure
E06	High compressor discharge temperature
E07	Indoor fan operating failure
E08	Way valve switching failure (RV)
E09	No refrigerant protection
E10	DC compressor drive circuit failure
E11	Outdoor fan operating failure
E12	Error in outdoor unit
E13	Freeze prevention activated

Air Conditioner Breakdowns and Repairs Mackay

Panasonic Cassette Air Conditioner Error Codes

Error Code	Description
E06	Outdoor unit failed to receive serial communication signals from indoor unit
E07	Outdoor unit sending failure to indoor unit
E12	Automatic address setting start is prohibited while auto-address setting in progress.
E14	Main unit duplication in simultaneous-operation multi control (detected outdoor unit)
E15	Automatic address alarm (capacity too low)
E16	Automatic address alarm (capacity too high)
E20	No indoor units connected
F04	Compressor discharge temperature sensor (TD) trouble
F06	Inlet temperature sensor (C1) in heat exchanger trouble
F07	Intermediate temperature (C2) in heat exchanger trouble

Air Conditioner Breakdowns and Repairs Mackay

Common Panasonic Air Conditioner Questions

Symptom	Cause
Mist emerges from indoor unit.	Condensation effect due to cooling process
Water flowing sound during operation.	Refrigerant flow inside the unit.
The room has a peculiar odour	This may be due to damp smell emitted by the wall, carpet, furniture or clothing
Indoor fan stops occasionally during automatic fan speed setting	This helps to remove the surrounding odour
Airflow continues even after operation has stopped	Extraction of remaining heat from the indoor unit (maximum 30 seconds)
Operation is delayed a few minutes after restarting	The delay is a protection to the unit’s compressor
Outdoor unit emits water/steam	Condensation or evaporation occurs on pipes
POWER indicator blinks during HEAT mode with no warm air supply (and louver is closed)	The unit is in defrost mode (and AIR SWING is set to AUTO)
Indoor fan stops occasionally during heating operation	To avoid unintended cooling effect
POWER indicator blinks before the unit is switched on	This is a preliminary step in preparation for the operation when the ON timer has been set
Cracking sound during operation	Changes of temperature caused the expansion/contraction of the unit
POWER indicator blinks 3 seconds ON and 0.5 seconds OFF during operation	The unit is in Demand Response Mode. Check: the following before calling for servicing
Noisy during operation	Check: Check if the unit has been installed at an incline. Close the front panel properly.
Remote control does not work	Check: Insert the batteries correctly. Replace weak batteries.
The unit does not work	Check: Check if the circuit breaker is tripped. Check if timers have been set.
The unit does not receive the signal from the remote control.	Check: Make sure the receiver is not obstructed. Certain fluorescent lights may interfere with signal transmitter. Please consult authorised dealer.

Troubleshooting Steps:

1. Power Reset: Turn off the unit, wait for a few minutes, and then turn it back on. Sometimes, a simple reset can resolve minor issues.
2. Check Connections: Ensure all connections related to the malfunctioning component are secure and properly connected.
3. Clean Filters and Coils: Dirty filters or coils can cause sensors to malfunction. Clean or replace filters and coils as necessary.
4. Check for Blockages: Ensure there are no obstructions blocking airflow around the indoor and outdoor units.
5. Verify Power Supply: Make sure the unit is receiving proper power supply. Check circuit breakers and fuses.
6. Professional Service: If troubleshooting steps do not resolve the issue, contact a qualified technician or refer to the user manual for further guidance.