[5-2 Outdoor Unit Control ]
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HWE12050 GB
5-2-13 Emergency Operation Mode
1. Problems with the outdoor unit
Emergency operation mode is a mode in which outdoor units that are operating normally take over the operation of the out-
door units that are experiencing problems. (EP400-EP600YSKM models go into an emergency operation mode when one
outdoor unit is in trouble, and EP650-EP900YSKM models go into an emergency operation mode when one or two outdoor
units 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 outdoor units)
Emergency operation pattern (3 outdoor units)
Trouble source
Error codes that permit an
emergency operation
Error code description
Compressor
Fan motor
Inverter
0403 Serial communication error
4220,4225,4226 Bus voltage drop
4230,4235 Heatsink overheat protection
4240,4245 Overload protection
4250,4255,4256 Overcurrent relay trip
5110 Heatsink temperature sensor failure (THHS)
5301 Current sensor/circuit failure
5305,5306 Position error
Thermistor TH2 5102 Subcool heat exchanger bypass outlet temperature sensor failure
TH3 5103 Pipe temperature sensor failure
TH4 5104 Discharge temperature sensor failure
TH5 5105 Accumulator inlet temperature sensor failure
TH6 5106 Subcool heat exchanger liquid outlet sensor failure
TH7 5107 Outside air temperature sensor failure
Power 4102 Open phase
4115 Power supply sync signal abnormality
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
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