Panasonic WH-UD05EE5 - Error Codes Table

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16.4 Error Codes Table
Diagnosis display Abnormality/Protection control Abnormality judgement Primary location to verify
H00 No abnormality detected — —
H12 Indoor/Outdoor capacity unmatched 90s after power supply
 Indoor/outdoor connection wire
 Indoor/outdoor PCB
 Specification and combination table in
catalogue
H15 Outdoor compressor temperature sensor
abnormality
Continue for 5 sec.
 Compressor temperature sensor
(defective or disconnected)
H23 Indoor refrigerant liquid temperature
sensor abnormality
Continue for 5 sec.
 Refrigerant liquid temperature sensor
(defective or disconnected)
H42 Compressor low pressure abnormality —
 Outdoor pipe temperature sensor
 Clogged expansion valve or strainer
 Insufficient refrigerant
 Outdoor PCB
 Compressor
H62 Water flow switch abnormality Continue for 1 min.
 Water flow switch
H64 Refrigerant high pressure abnormality Continue for 5 sec.
 Outdoor high pressure sensor
(defective or disconnected)
H70 Back-up heater OLP abnormality Continue for 60 sec.
 Back-up heater OLP
(Disconnection or activated)
H72 Tank sensor abnormal Continue for 5 sec.
 Tank sensor
H76 Indoor - control panel communication
abnormality
—
 Indoor - control panel
(defective or disconnected)
H90 Indoor/outdoor abnormal communication > 1 min after starting operation
 Internal/external cable connections
 Indoor/Outdoor PCB
H91 Tank heater OLP abnormality Continue for 60 sec.
 Tank heater OLP
(Disconnection or activated)
H95 Indoor/Outdoor wrong connection —
 Indoor/Outdoor supply voltage
H98 Outdoor high pressure overload
protection
—
 Outdoor high pressure sensor
 Water pump or water leakage
 Clogged expansion valve or strainer
 Excess refrigerant
 Outdoor PCB
H99 Indoor heat exchanger freeze prevention —
 Indoor heat exchanger
 Refrigerant shortage
F12 Pressure switch activate 4 times occurrence within 20
minutes
 Pressure switch
F14 Outdoor compressor abnormal revolution 4 times occurrence within 20
minutes
 Outdoor compressor
F15 Outdoor fan motor lock abnormality 2 times occurrence within 30
minutes
 Outdoor PCB
 Outdoor fan motor
F16 Total running current protection 3 times occurrence within 20
minutes
 Excess refrigerant
 Outdoor PCB
F20 Outdoor compressor overheating
protection
4 times occurrence within 30
minutes
 Compressor tank temperature sensor
 Clogged expansion valve or strainer
 Insufficient refrigerant
 Outdoor PCB
 Compressor
F22 IPM (power transistor) overheating
protection
3 times occurrence within 30
minutes
 Improper heat exchange
 IPM (Power transistor)
F23 Outdoor Direct Current (DC) peak
detection
7 times occurrence
continuously
 Outdoor PCB
 Compressor
F24 Refrigeration cycle abnormality 2 times occurrence within 20
minutes
 Insufficient refrigerant
 Outdoor PCB
 Compressor low compression
F25 Cooling/Heating cycle changeover
abnormality
4 times occurrence within 30
minutes
 4-way valve
 V-coil
F27 Pressure switch abnormality Continue for 1 min.
 Pressure switch
F36 Outdoor air temperature sensor
abnormality
Continue for 5 sec.
 Outdoor air temperature sensor
(defective or disconnected)
F37 Indoor water inlet temperature sensor
abnormality
Continue for 5 sec.
 Water inlet temperature sensor
(defective or disconnected)
F40 Outdoor discharge pipe temperature
sensor abnormality
Continue for 5 sec.
 Outdoor discharge pipe temperature
sensor (defective or disconnected)