Mitsubishi Electric MXZ-2D33VA-E1 Service Manual page 90

Check of bus-bar voltage
MXZ-3D54VA/3D68VA/4D72VA
MXZ-4D83VA/5D102VA
Blink 5 times
Replace the power P.C.
board.
Turn ON the breaker.
Start operation.
Conf rm LED1 indication lamp
on the outdoor control P.C.
board.
Blink 9 times
Replace the outdoor
control P.C. board.
Turn OFF the breaker before removing P.C. board.
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.
OBH626B
•Check the voltage of power supply.
•Conf rm outdoor unit failure mode
recall function. (Refer to 11-2.2.)
Conf rm LED1 indication lamp on the
outdoor control P.C. board.
Replace the outdoor control
P.C. board .
Normal
Lighting
Blink 6 times
Replace the outdoor control
P.C. board.
Turn ON the breaker.
Start operation.
Conf rm LED1 indication lamp
on the outdoor control P.C.
Lighting
board.
Replace the power P.C.
board.
90
Lighting
Blink 9 times