Error Codes Table - Panasonic WH-MHF12G9E8 Service Manual

16.4

Error Codes Table

Diagnosis display Abnormality/Protection control
H00 No abnormality detected
H12 Indoor/Outdoor capacity unmatched
Outdoor compressor temperature sensor
H15
abnormality
H20 Water pump abnormality
Indoor refrigerant liquid temperature
H23
sensor abnormality
H27 Service valve error
H42 Compressor low pressure abnormality
H62 Water flow switch abnormality
H63 Refrigerant low pressure abnormality
H64 Refrigerant high pressure abnormality
H70 Back-up heater OLP abnormality
H72 Tank sensor abnormal
Indoor - remote control communication
H76
abnormality
H90 Indoor/outdoor abnormal communication
H91 Tank heater OLP abnormality
H95 Indoor/Outdoor wrong connection
Outdoor high pressure overload
H98
protection
H99 Indoor heat exchanger freeze prevention
F12 Pressure switch activate
F14 Outdoor compressor abnormal revolution
F15 Outdoor fan motor lock abnormality
F16 Total running current protection
Outdoor compressor overheating
F20
protection
IPM (power transistor) overheating
F22
protection
Outdoor Direct Current (DC) peak
F23
detection
F24 Refrigeration cycle abnormality
Cooling/Heating cycle changeover
F25
abnormality
F27 Pressure switch abnormality
F30 Water outlet sensor 2 abnormality
Outdoor air temperature sensor
F36
abnormality
Abnormality Judgement
—
90s after power supply
Continue for 5 sec.
Continue for 10 sec.
Continue for 5 sec.
Continue for 5 minutes
—
Continue for 1 min.
4 times occurrence within
20 minutes
Continue for 5 sec.
Continue for 60 sec.
Continue for 5 sec.
—
> 1 min after starting operation
Continue for 60 sec.
—
—
—
4 times occurrence within 20
minutes
4 times occurrence within 20
minutes
2 times occurrence within 30
minutes
3 times occurrence within 20
minutes
4 times occurrence within 30
minutes
3 times occurrence within 30
minutes
7 times occurrence
continuously
2 times occurrence within 20
minutes
4 times occurrence within 30
minutes
Continue for 1 min.
Continue for 5 sec.
Continue for 5 sec.
87
Primary location to verify
—
 Indoor/outdoor connection wire
 Indoor/outdoor PCB
 Specification and combination table in
catalogue
 Compressor temperature sensor
(defective or disconnected)
 Indoor PCB
 Water pump (malfunction)
 Refrigerant liquid temperature sensor
(defective or disconnected)
 High pressure sensor (defective or
 disconnected)
 Outdoor pipe temperature sensor
 Clogged expansion valve or strainer
 Insufficient refrigerant
 Outdoor PCB
 Compressor
 Water flow switch
 Outdoor low pressure sensor (defective
or disconnected)
 Outdoor high pressure sensor
(defective or disconnected)
 Back-up heater OLP
(Disconnection or activated)
 Tank sensor
 Indoor - control panel
(defective or disconnected)
 Internal/external cable connections
 Indoor/Outdoor PCB
 Tank heater OLP
(Disconnection or activated)
 Indoor/Outdoor supply voltage
 Outdoor high pressure sensor
 Water pump or water leakage
 Clogged expansion valve or strainer
 Excess refrigerant
 Outdoor PCB
 Indoor heat exchanger
 Refrigerant shortage
 Pressure switch
 Outdoor compressor
 Outdoor PCB
 Outdoor fan motor
 Excess refrigerant
 Outdoor PCB
 Compressor tank temperature sensor
 Clogged expansion valve or strainer
 Insufficient refrigerant
 Outdoor PCB
 Compressor
 Improper heat exchange
 IPM (Power transistor)
 Outdoor PCB
 Compressor
 Insufficient refrigerant
 Outdoor PCB
 Compressor low compression
 4-way valve
 V-coil
 Pressure switch
 Water outlet sensor 2 (defective or
 disconnected)
 Outdoor air temperature sensor
(defective or disconnected)