Mitsubishi Electric MXZ-2D33VA Service Manual page 154

The other cases
Indoor unit does not operate. (different operating models in multi system)
• When you try to run 2 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 outdoor refrigerant circuit
Has the operation stopped
during pump down?
Yes
The operation has stopped to pre-
vent the diesel explosion caused by
air trapped in the refrigerant circuit.
Close the stop valve, and disconnect
the power plug or turn the power sup-
ply OFF.
CAUTION : Do not start the opera-
tion again to prevent
hazards.
OBH626K
Was the operation started with
the stop valve closed, and was
No
it opened during operation?
No
The refrigerant gas amount may be
60% or less than the normal amount.
Identify where the gas is leaking from,
and fi x the leak.
154
The unit occasionally stops when the
stop valve is opened or closed during
operation. Open the stop valve and
Yes
start the cooling operation again.