Emergency Operation Mode - Mitsubishi Electric PUHY-P200 Service Handbook

[5-2 Outdoor Unit Control ]
5-2-14

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. (P400-P900YSKB models go into an emergency operation mode when one out-
door unit is in trouble, and P950-P1350YSKB 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)
Trouble source
Compressor
Fan motor
Inverter
Thermistor TH2
TH3
TH4
TH5
TH6
TH7
TH9
TH11
Power
Emergency operation pattern (2 outdoor units)
HWE14040
Error codes that permit an
emergency operation
0403
4220,4225,4226
4230,4235
4240,4245
4250,4255,4256
5110
5120
5301
5305,5306
5102
5103
5104
5105
5106
5107
5109
5111
4102
4115
OC
OS
Emergency
operation
Maximum total capacity
of indoor units (Note 1)
Error code description
Serial communication error
Bus voltage drop
Heatsink overheat protection
Overload protection
Overcurrent relay trip
Heatsink temperature sensor failure (THHS)
DCL temperature sensor circuit fault
Current sensor/circuit failure
Position error
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
Continuous heating temperature sensor fault
Continuous heating temperature sensor fault
Open phase
Power supply sync signal abnormality
OC failure OS failure
pattern pattern
Trouble Normal
Normal Trouble
Cooling
Permitted Permitted
Heating
Permitted Permitted
60%
- 102 -
GB