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HWE1018A GB
-13- Emergency Operation Mode
Backup mode is a mode in which the unit is operated when the thermistor malfunctions. The unit automatically goes into the
backup mode when the following error is detected.
(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) Only the outdoor units that has not detected any errors will stay in operation.
3) If a TH2, TH3, TH5, or TH6 fault is detected, the sensor reading is complemented, and the unit will stay in operation.
4) If another thermistor fault is detected during the above-mentioned operation, the unit will make an abnormal stop.
Error codes that permit an emergency operation (Applicable to both OC and OS)
(2) Ending the emergency operation
1) End conditions
When one of the following conditions is met, emergency operation will end.
When an error is reset
*When resetting an error with the remote controller or the external input
When an error is detected that does not allow the unit to run the emergency operation.
(3) Miscellaneous
1) End conditions
When encountering problems other than the ones listed above, the system makes an error stop without performing emergen-
cy operation. (Only the indoor fan operates unless problems are found with the fan.)
When problems are found in only one of the two units of a 2-refrigerant circuit, only the unit with the problems will run an
emergency operation or stop its operation, and the other unit will keep running its operation.
Emergency operation is intended only as a first aid until the unit is serviced. Have the unit serviced without delay to restore a
normal operation.
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
Fan motor
Inverter
Thermistor
Power
TH2
TH3
TH4
TH5
TH6
TH7
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