Contents: 1. Split AC, 2. Multi AC, 3. Cassette AC Error Codes;
Panasonic Inverter Split AC Error Codes
Room temperature sensor failure
Indoor coil sensor failure
Humidity sensor failure
Comp. temperature sensor failure
Outdoor coil sensor failure
Outdoor air sensor failure
Outdoor current sensor failure
Indoor/outdoor communication failure
HIC circuit failure (Compressor/Fan circuit)
Outdoor unit OTP rom failure
Peak current cut off
PAM or Active circuit failure
High compressor discharge temperature
Indoor fan operating failure
Way valve switching failure (RV)
No refrigerant protection
DC compressor drive circuit failure
Outdoor fan operating failure
Error in outdoor unit
Freeze prevention activated
Note: “0″ – Frequency measured and fan speed fixed. The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until “beep” sound heard following by pressing the “CHECK” button at Remote Control. Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors by using Remote Control or Auto Switch at indoor unit. However, the Remote Control signal receiving sound is changed from one “beep” to four“beep” sounds.
To make a diagnosis
Timer LED start to blink and the unit automatically stops the operation
Press the CHECK button on the remote controller continuously for 5 seconds.
“- -” will be displayed on the remote controller display. Note: Display only for “- -”. (No transmitting signal, no receiving sound and no Power LED blinking.)
Press the “TIMER” + or – button on the remote controller. The code “H00” (no abnormality) will be displayed and signal will be transmitted to the main unit.
Every press of the button (up or down) will increase abnormality numbers and transmit abnormality code signal to the main unit.
When the latest abnormality code on the main unit and code transmitted from the remote controller are matched, power LED will light up for 30 seconds and a beep sound (continuously for 4 seconds) will be heard. If no codes are matched, power LED will light up for 0.5 seconds and no sound will be heard.
The breakdown diagnosis mode will be canceled by pressing the CHECK button continuously for 5 seconds or without any operation the remote control for 30 seconds.
The LED will be off if the unit is turned off or the AC button on the main unit is pressed.
To clear memorized error (Protective operation) status after repair:
1. Turn power on.
2. Press the AUTO button for 5 seconds (A beep receiving sound) on the main unit to operate the unit at Forced Cooling Operation mode.
3. Press the CHECK button on the remote controller for about 1 second with a pointed object to transmit signal to main unit. A beep sound is heard from main unit and the data is cleared.
Temporary Operation (Depending on breakdown status)
1. Press the AUTO button (A beep receiving sound) on the main unit to operate the unit. (Remote control will become possible.)
2. The unit can temporarily be used until repaired.
Panasonic Multi AC Error Codes
No abnormality detected
Indoor-outdoor abnormal communication
Indoor intake air temperature sensor abnormality
Outdoor compressor temperature sensor abnormality
Outdoor Current Transformer open circuit
Indoor fan motor merchanism lock
Indoor heat exchanger temperature sensor abnormality
Indoor heat exchanger temperature sensor 2 abnormality
Outdoor air temperature sensor abnormality
Outdoor heat exchanger temperature sensor abnormality
Outdoor discharge air temperature sensor abnormality
Indoor/Outdoor wrong connection
Indoor/outdoor mismatch (brand code)
Outdoor fan motor mechanism locked
Indoor high pressure protection
Indoor heat exchanger anti-freezing protection
Cooling/Heating cycle changeover abnormality
Refrigeration cycle abnormal
Outdoor compressor abnormal revolution
Cool high pressure protection
IPM (power transistor) overheating protection
Outdoor compressor overheating protection
Total running current protection
Outdoor Direct Current (DC) peak detection
Panasonic Cassette AC Error Codes
If the problem persists even after you check the foregoing items, stop the unit, disconnect the power to the indoor unit and contact the dealer where the product was purchased with the model number and problem you are having.
Outdoor unit failed to receive serial communication signals from indoor unit
Outdoor unit sending failure to indoor unit
Automatic address setting start is prohibited while auto-address setting in progress.
Main unit duplication in simultaneous-operation multi control (detected outdoor unit)
Automatic address alarm (capacity too low)
Automatic address alarm (capacity too high)
No indoor units connected
Compressor discharge temperature sensor (TD) trouble
Inlet temperature sensor (C1) in heat exchanger trouble
Intermediate temperature (C2) in heat exchanger trouble
Outdoor air temperature sensor (TO) trouble
Compressor inlet suction temperature sensor (TS) trouble
Outdoor unit nonvolatile memory (EEPROM) trouble
Primary (input) overcurrent detected
Primary current CT sensor (current sensor) failure
Sensor failure, Compressor discharge temperature sensor (TD) disconnected
Outdoor unit address duplication
Outdoor unit capacity not set
Indoor unit type setting error
4-way valve operation failure
Compressor discharge temperature trouble
High pressure trouble
AC power supply trouble
Alarm valve open
O2 sensor detect
Insufficient gas level detected
Compressor overcurrent trouble
Outdoor unit fan motor trouble
Lack of INV compressor wiring, INV compressor actuation failure (including locked) due to DCCT failure
Panasonic Air Conditioner Troubleshooting
The following symptoms do not indicate malfunction;
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
Cause: 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.
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