Panasonic CS-E21JB4EA / CU-E21HBEA Service Manual ▷ View online
65
15.5.18. 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
• 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)
× 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
• Refrigerant shortage (refrigerant leakage).
• Poor compression performance of compressor.
• 2/3 way valve closed.
• Detection error due to faulty indoor intake air or indoor pipe temperature sensors.
• Poor compression performance of compressor.
• 2/3 way valve closed.
• Detection error due to faulty indoor intake air or indoor pipe temperature sensors.
Troubleshooting
66
15.5.19. F93 (Compressor Rotation Failure)
Malfunction Decision Conditions
A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit.
A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit.
Malfunction Caused
• Compressor terminal disconnect.
• Outdoor PCB malfunction.
• Compressor malfunction.
• Outdoor PCB malfunction.
• Compressor malfunction.
Troubleshooting
67
15.5.20. F95 (Cooling High Pressure Abnormality)
Malfunction Decision Conditions
During operation of cooling, when outdoor unit heat exchanger high temperature data (61
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 outdoor unit.
• Dust accumulation on the outdoor 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.
• Dust accumulation on the outdoor 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
68
15.5.21. F96 (IPM Overheating)
Malfunction Decision Conditions
During operating of cooling and heating, when IPM temperature data (100
During operating of cooling and heating, when IPM temperature data (100
°C) is detected by the IPM temperature sensor.
Multi Models Only
• Compressor Overheating: During operation of cooling and heating, when the compressor OL is activated.
• Heat Sink Overheating: During operation of cooling and heating, when heat sink temperature data (90°C) is detected by the heat
• 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.
• 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
• Compressor OL connector poor contact.
• Compressor OL faulty.
• Compressor OL faulty.
Troubleshooting
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