Panasonic S-E7JKDW / U-E7JKD / S-E9JKDW / U-E9JKD / S-E12JKDW / U-E12JKD / S-E15JKDW / U-E15JKD / S-XE9JKDW / U-XE9JKD / S-XE12JKDW / U-XE12JKD Service Manual ▷ View online
89
16.4.22. F17 (Indoor Standby Units Freezing Abnormality)
Malfunction Decision Conditions
• When the different between indoor intake air temperature and indoor pipe temperature is above 10
° C or indoor pipe temperature
is below -1.0
° C
Remark:
When the indoor standby unit is freezing, the outdoor unit transfers F17 error code to the corresponding indoor unit and H39 to
other indoor unit(s).
When the indoor standby unit is freezing, the outdoor unit transfers F17 error code to the corresponding indoor unit and H39 to
other indoor unit(s).
Malfunction Caused
• Wrong wiring connection
• Faulty sensor
• Faulty expansion valve
• Faulty sensor
• Faulty expansion valve
Troubleshooting
90
16.4.23. F90 (Power Factor Correction Protection)
Malfunction Decision Conditions
During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry at the outdoor unit
main PCB senses abnormal high DC voltage level.
main PCB senses abnormal high DC voltage level.
Malfunction Caused
• DC voltage peak due to power supply surge.
• DC voltage peak due to compressor windings not uniform.
• Faulty outdoor PCB.
• DC voltage peak due to compressor windings not uniform.
• Faulty outdoor PCB.
Troubleshooting
91
16.4.24. 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) x compressor
running frequency + 0.25.
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
92
16.4.25. 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
• Outdoor PCB malfunction
• Outdoor PCB malfunction
Troubleshooting
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