Panasonic U-8ME1E81 Service Manual page 46

12. Backup Operation
12. Backup Operation
Alarm list 2 (Backup operation continues as long as the problem is not solved.)
Alarm display
F04 Discharge temperature sensor failure for compressor 1
F05 Discharge temperature sensor failure for compressor 2
F06 Gas temperature sensor in heat exchanger 1
1
F07 Liquid temperature sensor in heat exchanger 1
F08 Ambient air temperature
F12 Suction temperature
Temp. sensor at refrigerant gas outlet of dual-tube
F14
F16 High pressure sensor failure
F17 Low pressure sensor failure
F23 Gas temperature sensor in heat exchanger 2
F24 Liquid temperature sensor in heat exchanger 2
H05 Compressor 1 discharge temperature sensor disconnected
H08 Oil temperature sensor 1 (Inverter compressor)
H13 Compressor 2 CT sensor disconnected or short-circuit
H15 Compressor 2 discharge temperature sensor disconnected
Compressor 3 CT sensor disconnected or short-circuit
H23
H25 Compressor 3 discharge temperature sensor disconnected
H27 Oil temperature sensor 2 (Constant-speed compressor 1)
H28 Oil temperature sensor 3 (Constant-speed compressor 2)
P03 Compressor 1 discharge temperature trouble
P17 Compressor 2 discharge temperature trouble
Compressor 3 discharge temperature trouble
P18
A : When there is one outdoor unit in the system, only compressor that has sensor failure stops.
When there are multiple outdoor units in the system, only the outdoor unit which contains the problem
stops but the other outdoor units in the system operate normally.
B : When there is one outdoor unit in the system, the backup operation does not work.
When there are multiple outdoor units in the system, only the outdoor unit which contains the problem
stops but the other outdoor units in the system operate normally.
* Backup operation caused by an alarm listed in "alarm list 2" will finish automatically after 24 hours if the same
alarm does not occur again for 24 hours.
Control Functions-Outdoor Unit Control Functions - Outdoor Unit
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2WAY SYSTEM
2WAY SYSTEM
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