Mitsubishi Electric MXZ-2HA40VF-E1 Service Manual page 62

Check of outdoor refrigerant circuit
MXZ-2HA40VF/2HA50VF
Has the operation stopped during pump down?
No
Was the operation started with the stop valve
closed, and was 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.
OBH828B
The operation has stopped to prevent the diesel explosion
caused by air trapped in the refrigerant circuit. Close the stop
Yes
valve, and disconnect the power plug or turn the breaker OFF.
CAUTION:
Do not start the operation again to prevent hazards.
The unit occasionally stops when the stop valve is opened
or closed during operation. Open the stop valve and start the
Yes
cooling operation again.
62