Mitsubishi MSZ-FA25VA Service Manual page 25

When All lamps flash ON and OFF every 0.5-second.
Indoor unit and outdoor unit do not operate.
Check of installation of the horizontal vane
E
Start
Turn OFF the
power supply.
Is the stopper of the horizontal vane
locked to the indoor unit correctly?
Yes
To check the continuity of the interlock switch
(Fan), measure the resistance of connector 1 - 2
connected to CN1R1 on the indoor
electronic control P.C. board.
Is there resistance 0 "?
Yes
Replace the
indoor electronic
control P.C. board.
No
Relock the stopper of the
horizontal vane to the indoor unit.
Refer to 9-1.5.
Turn ON the
power supply.
Are all lamp flashing?
Turn OFF the
power supply.
No( )
Replace the
interlock switch(Fan).
No
OK
Yes
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