Panasonic CS-VG120KE, Service Manual, Page: 54 / 80

Diagnosis display Abnormality/Protection control Abnormality
Judgement
Temporary
operation
Primary location to verify
H11 Indoor/outdoor abnormal
communication 1 min after starting
operation - ∙ Internal/external cable connections
∙
Indoor/Outdoor PCB
H14 Indoor intake air temperature sensor
abnormality - ∙
Intake air temperature sensor (defective
or disconnected)
H15 Outdoor compressor temperature
sensor abnormality - ∙
Compressor temperature sensor
(defective or disconnected)
H16 Outdoor Current Transformer open
circuit - ∙ Outdoor PCB
∙
Power transistor module
H19 Indoor fan motor mechanism lock - ∙
Indoor PCB
∙ Fan motor
H23 Indoor heat exchanger temperature
sensor abnormality
●
(Cooling only)
∙ Heat exchanger temperature sensor
(defective or disconnected)
H27 Outdoor air temperature sensor
abnormality ● ∙ Outdoor temperature sensor (defective or
disconnected)
H28 Outdoor heat exchanger
temperature sensor abnormality
●
∙
Outdoor heat exchanger temperature
sensor (defective or disconnected)
H98 Indoor high pressure protection - ∙ Air filter dirty
∙
Air circulation short circuit
H99 Indoor heat exchanger anti-freezing
protection - ∙
Insufficient refrigerant
∙ Air filter dirty
F11 Cooling/Heating cycle changeover
abnormality 4 times
occurrence within
40 minutes - ∙
4-way valve
∙ V-coil
F91 Refrigeration cycle abnormality 2 times
occurrence within
30 minutes - ∙
No refrigerant (3-way valve is closed)
F93 Compressor motor rotation
abnormality 2 times
occurrence within
30 minutes - ∙
Compressor
∙ Outdoor P.C.Board
F95 Over heating protections 3 times
occurrence within
30 minutes - ∙
Pipe sensor
F96 Outdoor power transistor module
overheating protection 4 times
occurrence within
30 minutes - ∙
Excess refrigerant
∙ Improper heat radiation
∙
Power transistor
F97 Outdoor compressor overheating
protection 4 times
occurrence within
20 minutes - ∙ Insufficient refrigerant
∙
Compressor
F98 Total running current protection 3 times
occurrence within
30 minutes - ∙ Excess refrigerant
∙
Improper heat radiation
F99 Outdoor Direct Current (DC) peak
detection 2 times
occurrence
continuously - ∙ Outdoor PCB
∙
Power transistor
∙ Compressor
1. Current Transformer Defective
When the Current Transformer (CT) is an open circuit, total running current is less than 1.51 A and the indicated frequency is
73Hz or above. After 3 minutes of operation, the abnormality signal is sent from outdoor to indoor and [H16] is displayed.
2. 4 Way Valve Defective
a. Heating Operation (except Deice)
After 4 minutes of operation, the indoor heat exchanger temperature is lower than 5°C. The operation stops and restarts
after 3 minutes. If this phenomenon occurs for 4 times within 40 minutes, [F11] is displayed.
b. Cooling Operation
After 4 minutes of operation, indoor heat exchanger temperature is higher than 45°C. The operation stops and restarts after
3 minutes. If this phenomenon occurs for 4 times within 40 minutes, [F11] is displayed.
The abnormality judgement is not carried out, in the following conditions:
— deice operation
— 2 minutes after deice operation
— hot start
— 2 minutes after hot start
— 3 minutes after heating and cooling/soft dry mode changeover
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CS-VG120KE / CU-VG120KE