Panasonic U-8MF2E8 Service Manual page 53

12. Backup Operation
Alarm list 2 (Backup operation continues as long as the problem doesn't solve)
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
F07 Liquid temperature sensor in heat exchanger 1
F08 Ambient air temperature
F12 Suction temperature
F14 Temp. sensor at refrigerant gas outlet of dual-tube
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
H27 Oil temperature sensor 2 (Constant-speed compressor 1)
P03 Compressor 1 discharge temperature trouble
P17 Compressor 2 discharge temperature trouble
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, the outdoor unit which contains the problem stops.
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, the outdoor unit which contains the problem stops.
* 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.
12-1-2. Start of Automatic Backup Operation
If the above alarms occur, the alarm is displayed on the remote controller etc.
Pressing the remote controller button again starts automatic backup mode.
When the backup operation is started, operation just before the automatic backup can only be worked.
In the case of all cooling mode or mixed condenser operation, cooling and fan operation can only be worked and
heating thermostat is turned OFF.
In the case of all heating mode or mixed evaporator operation, heating and fan operation can only be worked and
cooling thermostat is turned OFF.
12-1-3. Backup Operation Information Display
If a wired remote controller is present, display blinks during operation.
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3WAY SYSTEM
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