Panasonic CS-E7NKDW / CS-E9NKDW / CS-E12NKDW / CS-E15NKDW / CS-E18NKDW / CU-E7NKD / CU-E9NKD / CU-E12NKD / CU-E15NKD / CU-E18NKD Service Manual ▷ View online
97
16.4.23 F91 (Refrigeration Cycle Abnormality)
Malfunction Decision Conditions
During cooling, compressor frequency = Fcmax.
During heating, compressor frequency > Fhrated.
During cooling and heating operation, running current: 0.65A < I < 1.65A.
During cooling, indoor intake - indoor pipe < 4°C
During heating, indoor pipe - indoor intake < 5°C
Multi Models Only
Gas shortage detection 1: A gas shortage is detected by checking the CT-detected input current value
and the compressor running frequency. During startup and operating of cooling and heating, input
current < 8.78/256 (A/Hz) x compressor running frequency + 0.25.
current < 8.78/256 (A/Hz) x compressor running frequency + 0.25.
Gas shortage detection 2: A gas shortage is detected by checking the difference between indoor pipe
temperature and indoor intake air temperature during cooling and heating.
Malfunction Caused
Faulty indoor intake air or pipe temperature sensor
2/3 way valve closed
Refrigerant shortage (refrigerant leakage)
Clogged expansion valve or strainer
Faulty outdoor unit
Poor compression of compressor
Troubleshooting
98
16.4.24 F93 (Compressor Rotation Failure)
Malfunction Decision Conditions
A compressor rotation failure is detected by checking the compressor running condition through the position
detection circuit.
Malfunction Caused
Compressor terminal disconnect
Faulty Outdoor PCB
Faulty
compressor
Troubleshooting
99
16.4.25 F95 (Cooling High Pressure Abnormality)
Malfunction Decision Conditions
During operation of cooling, when outdoor unit heat exchanger high temperature data (61°C) is detected by the
outdoor pipe temperature sensor.
Malfunction Caused
Air short circuit at indoor unit
Dust accumulation on the indoor unit heat exchanger
2/3 way valve closed
Faulty outdoor unit fan motor
Excessive
refrigerant
Clogged expansion valve or strainer
Faulty outdoor pipe temperature sensor
Faulty outdoor unit PCB
Troubleshooting
100
16.4.26 F96 (IPM Overheating)
Malfunction Decision Conditions
During operating of cooling and heating, when IPM temperature data (100°C) is detected by the IPM temperature
sensor.
Multi models only
o
Multi models only
o
Compressor Overheating: During operation of cooling and heating, when the compressor OL is activated.
o
Heat Sink Overheating: During operation of cooling and heating, when heat sink temperature data (90°C) is
detected by the heat sink temperature sensor.
Malfunction Caused
IPM overheats due to short circuit of hot discharge air flow.
IPM overheats due to defective of outdoor fan motor.
IPM overheats due to defective of internal circuitry of IPM.
IPM overheats due to defective IPM temperature sensor.
Multi Models Only
o
o
Compressor OL connector poor contact.
o
Compressor
OL
faulty.
Troubleshooting
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