Panasonic Heat Pump Troubleshooting

When something happens with your Panasonic heat pump, stop worrying and know that you can do the repair on your own. But you aren’t going to be alone because the troubleshooting manual is by your side. It will become a nice helper when something goes wrong. The detailed descriptions of the issues will guide you through the process.

Panasonic WH-MXC12G9E8 Heat Pump Troubleshooting

Diagnostic displayAbnormality or Protection control works
H12Capacity mismatch
H15Abnormal compressor temperature sensor
H20Abnormal water pump
H23Abnormal refrigerant 1 sensor
H27Abnormal service valve
H42Compressor low pressure protection
H62Abnormal water flow
H64Abnormal high pressure sensor
H65Abnormal deice water circulation
H70Abnormal back-up heater overload protector
H72Abnormal tank temperature sensor
H76Remote control communication error
H90Abnormal indoor / outdoor communication
H91Abnormal tank heater overload protector
H95Abnormal voltage connection
H98Outdoor high pressure protection
H99Indoor heat exchanger freeze prevention

Panasonic WH-MDC06G3E5 Heat Pump Troubleshooting

Diagnostic displayAbnormality or Protection control works
F12Pressure switch activated
F14Poor compressor rotation
F15Abnormal outdoor fan motor lock
F16Comprehensive current protection
F20Compressor temperature overload protection
F22Transistor module temperature overload protection
F23DC peak abnormal of operation
F24Abnormal Refrigerant cycle
F25Abnormal in a cooling / heating charge
F27Abnormal pressure switch
F30Abnormal water outlet sensor 2
F36Abnormal outdoor air temperature sensor
F37Abnormal water inlet sensor
F40Abnormal outdoor discharge sensor
F41Abnormal power factor correction
F42Abnormal outdoor heat exchanger sensor
F43Abnormal outdoor defrost sensor
F45Abnormal water outlet sensor
F46Abnormalities in outdoor current transformer disconnection
F48Abnormal evaporator outlet temperature sensor
F49Abnormal bypass outlet temperature sensor
F95Abnormal cooling high pressure

Panasonic LIAC12IM6 Heat Pump Troubleshooting

SYMPTOMCAUSE
Flowing sound during operation.• Refrigerant flow inside the unit.
Operation is delayed a few minutes after restart.• The delay is a protection to the unit’s compressor.
Outdoor unit emits water/steam.• Condensation or evaporation occurs on pipes.
Outdoor unit emits steam during heating mode.• This is due to defrost operation happens at the heat exchanger.
Outdoor unit does not operate.• When the outdoor temperature is out of the operation condition range, the heatpump system enter protection control.
Air-to-Water Heatpump system operation will turn off.• If indoor unit water inlet temperature is lower than 20°C and outdoor ambient temperature lower than 10°C. Backup heater power will turn on to heat up the water.
System difficult to heat-up.• When heating is operated by indoor unit together with floor heating or panel heater simultaneously, there may be case where warm water temperature is getting lower and cause floor heating or panel heater heat-up is weaken.
• When outdoor air temperature is low, it may be difficult to get warm.
• Is the snow pile blocking the discharge outlet or intake inlet of outdoor unit.
• When water outlet set temperature is low, it may be difficult to get warm.
System cannot get warm instantly.• Due to the nature of the heatpump system, it may take some time to heat-up the water if the unit is operated from cold-start.
Operation starts after power resumes.• Unit is operates under auto restart function.

Panasonic S-125MW1E5 Heat Pump Troubleshooting

CodeCauseHow to Release
E03Remote controller communication errorAutomatic
E04Abnormal indoor/outdoor communication error
F01Abnormal refrigerant sensor 1 (E1)
F02Abnormal water outlet sensor 1 (E2)
F03Abnormal refrigerant sensor 2 (E3)
F10Abnormal water intlet sensor (TA)
F11Abnormal water outlet sensor 2 (BL)
L13Mismatched indoor unitReset (On and off of the power supply)
L16Test run for water circuit is not finishedDo test run for water circuit
L25Unmatched remote controllerReset (On and off of the power supply)
P07Abnormal Internal heater overloadCancel from the remote controller
P09Abnormal water flowRe-run
P12Abnormal water pump speed

Panasonic CS-E18NKUA Heat Pump Troubleshooting

Diagnosis displayAbnormality / Protection controlAbnormality JudgmentProtection OperationProblemCheck location
H00No memory of failureNormal operation
H11Indoor/outdoor Abnormal communicationAfter operation for 1 minuteIndoor fan only operation can start by entering into force cooling operationIndoor/outdoor communication not establish• Indoor/outdoor wire terminal
• Indoor/outdoor PCB
• Indoor/outdoor connection wire
H12Indoor unit capacity unmatched90s after power supplyTotal indoor capability more than maximum limit or less than minimum limit, or number of indoor unit less than two• Indoor/outdoor connection wire
• Indoor/outdoor PCB
• Specification and combination table in catalogue
H14Indoor intake air temperature sensor abnormalityContinuous for 5sIndoor intake air temperature sensor open or short circuit• Indoor intake air temperature sensor lead wire and connector
H15Compressor temperature sensor abnormalityContinuous for 5sCompressor temperature sensor open or short circuit• Compressor temperature sensor lead wire and connector
H16Outdoor current transformer (CT) abnormalityCurrent transformer faulty or compressor faulty• Outdoor PCB faulty or compressor faulty
H19Indoor fan motor merchanism lockContinuous happen for 7 timesIndoor fan motor lock or feedback abnormal• Fan motor lead wire and connector
• Fan motor lock or block
H23Indoor heat exchanger temperature sensor abnormalityContinuous for 5sIndoor heat exchanger temperature sensor open or short circuit• Indoor heat exchanger temperature sensor lead wire and connector
H24Indoor heat exchanger temperature sensor 2 abnormalityContinuous for 5sIndoor heat exchanger temperature sensor 2 open or short circuit• Indoor heat exchanger temperature sensor 2 lead wire and connector
H25Indoor ion device abnormalityPort is ON for 10s during ion device off• ion device PCB
H27Outdoor air temperature sensor abnormalityContinuous for 5sOutdoor air temperature sensor open or short circuit• Outdoor air temperature sensor lead wire and connector
H28Outdoor heat exchanger temperature sensor 1 abnormalityContinuous for 5sOutdoor heat exchanger temperature sensor 1 open or short circuit• Outdoor heat exchanger temperature sensor 1 lead wire and connector
H30Outdoor discharge pipe temperature sensor abnormalityContinuous for 5sOutdoor discharge pipe temperature sensor open or short circuit• Outdoor discharge pipe temperature sensor lead wire and connector
H32Outdoor heat exchanger temperature sensor 2 abnormalityContinuous for 5sOutdoor heat exchanger temperature sensor 2 open or short circuit• Outdoor heat exchanger temperature sensor 2 lead wire and connector
H33Indoor / outdoor Misconnection abnormalityIndoor and outdoor rated voltage different• Indoor and outdoor units check
H34Outdoor heat sink temperature sensor abnormalityContinuous for 2sOutdoor heat sink temperature sensor open or short circuit• Outdoor heat sink sensor
H36Outdoor gas pipe temperature sensor abnormalityContinuous for 5sHeating protection operation onlyOutdoor gas pipe temperature sensor open or short circuit• Outdoor gas pipe temperature sensor lead wire and connector

Panasonic Mini UM M Heat Pump Troubleshooting

SYMPTOMCHECK
Heating/Cooling operation is not working efficiently.• Set the temperature correctly.
• Close all doors and windows.
• Clean or replace the filters.
• Clear any obstruction at the air inlet and air outlet vents.
Noisy during operation.• Check if the unit has been installed at an incline.
• Close the front panel properly.
Remote control does not work. (Display is dim or transmission signal is weak.)• Insert the batteries correctly.
• Replace weak batteries.
The unit does not work.• Check if the circuit breaker is tripped.
• Check if timers have been set.
The unit does not receive the signal from the remote control.• Make sure the receiver is not obstructed.
• Certain fluorescent lights may interfere with signal transmitter. Please consult authorized dealer.

Panasonic WH-ADC Series Heat Pump Troubleshooting

Diagnosis displayAbnormality / Protection controlAbnormality JudgmentProblemCheck location
F114-way valve Switching abnormality4 times happen within 30 minutes4-way valve switching abnormal• 4-way valve
• Lead wire and connector
F17Indoor standby units freezing abnormality3 times happen within 40 minutesWrong wiring and connecting pipe, expansion valve leakage, indoor heat exchanger sensor open circuit• Check indoor/outdoor connection wire and pipe
• Indoor heat exchanger sensor lead wire and connector
• Expansion valve lead wire and connector
F90Power factor Correction (PFC) circuit protection4 times happen within 10 minutesPower factor correction circuit abnormal• Outdoor PCB faulty
F91Refrigeration cycle abnormality2 times happen within 20 minutesRefrigeration cycle abnormal• Insufficient refrigerant or valve close
F93Compressor abnormal revolution4 times happen within 20 minutesCompressor abnormal revolution• Power transistor module faulty or compressor lock
F94Compressor discharge overshoot protection4 times happen within 30 minutesCompressor discharge pressure overshoot• Check refrigeration system
F95Outdoor cooling high pressure protection4 times happen within 20 minutesCooling high pressure protection• Check refrigeration system
• Outdoor air circuit
F96Power transistor module overheating protection4 times happen within 30 minutesPower transistor module overheat• PCB faulty
• Outdoor air circuit (fan motor)
F97Compressor Overheating protection3 times happen within 30 minutesCompressor overheat• Insufficient refrigerant
F98Total running current protection3 times happen within 20 minutesTotal current protection• Check refrigeration system
• Power source or compressor lock
F99Outdoor direct current (DC) peak detectionContinuous happen for 7 timesPower transistor module current protection• Power transistor module faulty or compressor lock