Mitsubishi Electric MSZ-LN-VG Series Service Manual page 120

Check of outdoor refrigerant circuit
MXZ-2F33VF/2F42VF/2F53VF/2F53VFH
MXZ-2F33VF2/2F42VF2/2F53VF2/2F53VFH2
MXZ-2F33VF3/2F42VF3/2F53VF3/2F53VFH3
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 operation again to prevent hazards.
OBH790D
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 fix the leak.
120
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.