Mitsubishi Electric MXZ-2C30VA, Service Manual

Page: 109 / 396

109
The other cases
Indoor unit does not operate. (different operating models in multi system)
• When you try to run two indoor units simultaneously, one for cooling and the other for heating, the unit which transmits signal
to the outdoor unit first decides the operation mode.
• When the above situation occurs, set all the indoor units to the same mode, turn OFF the indoor units, then turn them back
ON.
• Though the top of the indoor unit sometimes gets warm, this does not mean malfunction. The reason is that the refrigerant
gas continuously flows into the indoor unit even while it is not operating.
Check of bus-bar voltage
•Check the voltage of power supply.
•Con fi rm outdoor unit failure mode
recall function. (Refer to 11-2.2.)
Blink 5 times
Con fi rm LED1 indication lamp on the
electronic control P.C. board.
Replace the power board.
Blink 9 times
Replace the electronic con-
trol P.C. board.
Turn OFF power supply before removing P.C. board.
Con fi rm LED1 indication lamp
on the electronic control P.C.
board.
Turn ON power supply.
Start operation.
Blink 6 times
Replace the electronic control
P.C. board .
Lighting
Replace the electronic
control P.C. board.
Blink 9 times
Replace the power board.
Con fi rm LED1 indication lamp
on the electronic control P.C.
board.
Turn ON power supply.
Start operation.
Normal
Lighting Lighting
MXZ-3C/4C/5C
OBH584G