Mitsubishi Electric MXZ-2C30VA Service Manual page 94

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
MXZ-3C/4C/5C
Blink 5 times
Replace the power board.
Turn ON power supply.
Start operation.
Confi rm LED1 indication lamp
on the outdoor electronic
control P.C. board.
Blink 9 times
Replace the outdoor
electronic control P.C. board.
Turn OFF power supply before removing P.C. board.
•Check the voltage of power supply.
•Confi rm outdoor unit failure mode
recall function. (Refer to 11-2.2.)
Confi rm LED1 indication lamp on
the outdoor electronic control P.C.
board.
Replace the outdoor electronic
control P.C. board .
Normal
Lighting
Blink 6 times
Replace the outdoor
electronic control P.C. board.
Turn ON power supply.
Start operation.
Confi rm LED1 indication lamp
on the outdoor electronic
Lighting
control P.C. board.
Replace the power board.
94
Lighting
Blink 9 times