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HWE09080 GB
-14- Emergency Operation Mode
1. Problems with the heat source unit
Emergency operation mode is a temporary operation mode in which the heat source unit that is not in trouble operates when
one of the heat source units in the P144 through P240 models is in trouble or when one or two of the heat source units in the
P264 through P360 models are in trouble.
This mode can be started by performing an error reset via the remote controller.
(1) Starting the emergency operation
1) When an error occurs, the error source and the error code will be displayed on the display on the remote controller.
2) The error is reset using the remote controller.
3) If an error code appears that permits an emergency operation in step 1) above, (See the table below.), the retry operation
starts.
4) If the same error is detected during the retry operation (step 3 above), an emergency operation can be started by resetting
the error via the remote controller.
Error codes that permit an emergency operation (Applicable to both OC and OS)
Emergency operation pattern (2 heat source units)
Emergency operation pattern (3 heat source units)
Trouble source
Error codes that permit an
emergency operation
Error code description
Serial communication error
Bus voltage drop
Heatsink overheat protection
Overload protection
Overcurrent relay trip
Heatsink temperature sensor failure (THHS)
Current sensor/circuit failure
Subcool heat exchanger bypass outlet temperature sensor failure
Pipe temperature sensor failure
Discharge temperature sensor failure
Accumulator inlet temperature sensor failure
Subcool heat exchanger liquid outlet sensor failure
Outside air temperature sensor failure
Open phase
Power supply sync signal abnormality
0403
4220, 4225
4230
4240
4250, 4255
5110
5301
5102
5103
5104
5105
5106
5107
4102
4115
Compressor
Inverter
Thermistor
Power
TH2
TH3
TH4
TH5
TH6
TH7
Water outlet temperature sensor fault5108
TH8
OC
OC failure
pattern
Trouble
Normal
Permitted Permitted
Permitted Permitted
60%
Cooling
Heating
Normal
Trouble
OS failure
pattern
OS
Emergency
operation
Maximum total capacity
of indoor units (Note 1)
OC
OC failure
pattern
Trouble Trouble Trouble
Normal
Normal NormalNormal
Normal Normal
60% 40%
Cooling
Heating
Normal Normal Normal
Trouble
Trouble Trouble Trouble
Trouble Trouble
OS1 failure
pattern
OS2 failure
pattern
OC, OS1 failure
pattern
OC, OS2 failure
pattern
OS1, OS2 failure
pattern
OS1
OS2
Emergency
operation
Maximum total capacity
of indoor units (Note 1)
(Note 1) If an attempt is made to put into operation a group of indoor units whose total capacity exceeds the maximum allowable capacity,
some of the indoor units will go into the same condition as Thermo-OFF.
Permitted
Permitted
Permitted
Permitted
Permitted
Permitted
Permitted
Permitted
Permitted
Permitted
Permitted
Permitted