Panasonic WH-SXC09H3E8

164
Diagnosis display Abnormality/Protection control Abnormality judgement Primary location to verify
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
F29 Low Discharge Superheat
1 times occurrence within
2550 minutes

Discharge Temperature Sensor
 Discharge Pressure Sensor
 Pressure Switch
 Outdoor PCB
F30 Water outlet sensor 2 abnormality Continue for 5 sec.

Water outlet sensor 2 (defective or
disconnected)
F32 Abnormal Internal Thermostat Continue for 5 sec.

Control panel PCB thermostat
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)
F41 PFC control
4 times occurrence within 10
minutes
 Voltage at PFC
F42
Outdoor heat exchanger temperature
sensor abnormality
Continue for 5 sec.

Outdoor heat exchanger temperature
sensor (defective or disconnected)
F43 Outdoor defrost sensor abnormality Continue for 5 sec.

Outdoor defrost sensor (defective or
disconnected)
F45
Indoor water outlet temperature sensor
abnormality
Continue for 5 sec.

Water outlet temperature sensor
(defective or disconnected)
F46
Outdoor Current Transformer open
circuit
—

Insufficient refrigerant
 Outdoor PCB
 Compressor low
F48
Outdoor EVA outlet temperature sensor
abnormality
Continue for 5 sec.

Outdoor EVA outlet temperature sensor
(defective or disconnected)
F49
Outdoor bypass outlet temperature
sensor abnormality
Continue for 5 sec.

Outdoor bypass outlet temperature
sensor (defective or disconnected)
F95
Cooling high pressure overload
protection
—

Outdoor high pressure sensor
 Water pump or water leakage
 Clogged expansion valve or strainer
 Excess refrigerant
 Outdoor PCB
Note: * This error code is not applicable for this system.