Troubleshooting Flow - Mitsubishi Electric Mr.Slim MSZ-GC22NA - C1 Service Manual

8-6. TROUBLESHOOTING FLOW

A Check of indoor fan motor
The indoor fan motor error has occurred, and the indoor fan doesn't operate.
MSZ-GC22/25/NA
MSZ-GC35/NA -
C1
Reconnect the lead wires.
Disconnect the lead wires from connector CN211 on indoor power P.C. board.
Measure the resistance between lead wires No.1 and No.4 and then No.4 and No.7.
Is the resistance 0 (short circuit) or
Indoor terminal
P.C.board
Fuse (F11)
Turn OFF the power supply.
Check connector CN211 visually.
No
Are lead wires connected?
Yes ( 0 or
Replace the indoor fan motor.
Indoor power P.C.board
Varistor
(NR11)
Are soldered points of the connector
Yes
correctly soldered to indoor power
P.C. board?
Turn ON the power supply. Rotate indoor fan slowly for 1
revolution or over with a screwdriver etc. from air outlet, and
(open circuit)?
No measure the voltage No.2(+) and No.1(-) on CN121.
(Others)
)
No
Replace the indoor power P.C. board and the indoor
terminal P.C. board and the indoor electronic control
P.C. board.
CN121
CN211
25
No
Yes
Does the voltage repeat 0 and 5 VDC?
Yes
Resolder it.