• The emergency operation is not a normal operating mode but a temporary operating mode until technical
service
maintenance personnel arrive. If the alarm is indicated again during the emergency operation, the alarm
cannot be cancelled.
• Do not run the emergency operation for more than eight hours. Otherwise, it may damage the unit.
(2) Emergency mode operation from the outdoor unit PCB for a Inverter compressor failure
(only for RAS-(14-18)FSXN)
This function is an emergency mode operation that uses the constant speed compressor when the Inverter compressor
fails.
Alarms corresponding to a failure of the Inverter compressor
Code Description of the failure
04 Abnormality transmitting between the Inverter PCB and outdoor PCB
06 Abnormal Inverter voltage
23 Abnormal discharge gas thermistor
48 Activation of the overcurrent protection device
51 Abnormal Inverter current sensor
53 Inverter error signal detection
54 Abnormal Inverter fin temperature
(a) Procedure:
1. Turn OFF the main switches to all the indoor and outdoor units.
2. Check
the inverter PCB; if it is damaged, disconnect terminals (U, V, W) from the diode module (isolate the disconnected
terminals).
3. Turn ON DSW5-#1 on PCB1 of the outdoor unit.
4. Turn ON the power supply.
5. Start operation using the remote control switch.
Place contact 1 or contact 2 of DSW5 to the ON position to stop the operation of the compressor (when two compressors
are stopped simultaneously, the indication d1-30 is displayed on the 7-segment display).
ON
1 2 3 4 5 6
DSW5 Compressor
1 Inverter Compressor
2 Constant Speed Compressor 1
(DSW5)
PCB1
(3) Emergency mode operation from the outdoor unit PCB for a constant speed compressor failure
8 Troubleshooting
155
SMGB0065 rev. 1 - 12/2010
8
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