Mitsubishi Heavy Industries FDE112KXE6A Service Manual Download

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(iv) If any anomaly occurs when the auto backup is effective, the operation output (CnH), Anomaly output (CnY), 7-seg-

ment display and LED show as follows.
1) At the system stop

Operation output on the master unit is turned OFF, the Anomaly output is turned ON, 7-segment display and
LED show the anomaly, and the remote controller displays E??. (To reset the anomaly, it is necessary to reset the
inspection from the remote controller.)

2) At the unit stop

On the unit only, the operation output is turned OFF, the Anomaly output is turned ON, 7-segment display and LED show
the anomaly and normal units continue their operation (stop).
To reset the state of anomaly on the unit the anomaly occurred, it depends on the condition to reset the state of each anomaly.

3) At the compressor stop

Only the compressor concerned stops, previous states are maintained on the operation output, anomaly output,
7-segment display and LED. To reset the state of anomaly on the compressor, it depends on the condition to reset
the state of each anomaly.

E31

E32

E36

E37

E38

E39

E40

E41

E42

E43

E45

E48

E49

E51

E53

E54

E55

E56

E59

E60

E61

E63

Duplicated outdoor unit address No.

Open L3 Phase on power supply at primary side

Discharge pipe temperature anomaliy

Outdoor air temperature thermistor anomaly

Discharge pipe temperature thermistor anomaly

High pressure anomaly

Power thansistor overheat

Current cut

Outdoor DC fan motor anomaly

Low pressure error

Suction pipe temperature thermistor anomaly

Under-dome temperature thermistor anomaly

Power transitor temperture thermistor anomaly

Compressor startup failure

Rotor position detection failure

Emergency stop

Anomaly contents

Anomalous stop of master outdoor unit

Anomalous stop of slave outdoor unit

System stop

Unit stop

Compressor stop System stop

Unit stop

Compressor stop

Remote controller

error display

Outdoor heat exchanger and subcooling
coil temperature thermistor anomaly

Communication error between inverter
PCB and outdoor control PCB

High pressure sensor/Low pressure
sensor anomaly

Power transister overheat (continuousness)

Excessive number of indoor unit connected,
excessive to tal capacity of connection

Communications error between the master
unit and slave units

Backup operation function is only for emergency purpose when one of compressors or one of units is damaged.

If backup operation is performed continuously for long period, it may cause the damage of good compressors.

Accordingly be sure to repair the damaged unit or to replace the damaged compressor and to cancel the

backup operation within 48 hours after starting backup operation.

(c) Prohibiting conditions of auto backup operation

(i)

When the conditions of oil return control are not established

(ii) When the backup operation time has exceeded the limit value

(d) Control after the conditions to prohibit the auto backup operation have been established

All compressor stop, and the error display [E-XX] is shown on the 7-segment display and the remote controller.
In this state, the inspection reset of remote controller is effective.

→

[E-XX] is displayed continuously on the remote con-

troller.