Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 267

10-5. Trouble criterion of main parts
MSZ-HC25VA MSZ-HC35VA
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12)
Indoor fan motor (MF)
MSZ-HC25
INNER FUSE
BA : 135i 3: CUT OFF
CA : 140i 2: CUT OFF
Indoor fan motor (MF)
Check 10-6.A .
MSZ-HC35
Vane motor (MV)
10-6. Troubleshooting flow
When OPERATION INDICATOR lamp flashes 3-times.
Indoor fan does not operate.
Check of indoor fan motor
A
MSZ-HC25VA
Turn OFF the power supply.
Check connector CN211 visually.
No
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 ∞ (open circuit)?
Indoor terminal
P.C.board
Fuse (F11)
MSZ-HC35VAB
Check method and criterion
Measure the resistance with a tester.
Refer to 10-7."Test point diagram and voltage",
"2.Indoor electronic control P.C. board", the chart of thermistor.
Measure the resistance between the terminals with a tester.
(Part temperature 10˚C ~ 30˚C)
Color of lead wire
RC4V18-BA
WHT – BLK 273
BLK – RED 295
Measure the voltage power ON.
Color of lead wire
BRN – YLW
(When fan revolved one time)
BRN – GRY
Measure the resistance between the terminals with a tester.
(Part temperature 10°C ~ 30°C)
Color of the lead wire
235 " ~ 255 "
RED-BLK
Are lead wires connected?
Yes ( 0 or ∞ )
Replace the indoor fan motor.
Indoor power P.C.board
CN121
Varistor
(NR11)
Normal
RC4V18-CA
~ 296
308 ~ 334
~ 320 295 ~ 320
Normal
4.5 ~ 5.5V
0V➔5V➔0V
(Approx.)
Normal
Are soldered points of the
Yes
connector correctly soldered to
indoor power P.C. board?
Yes
Turn ON the power supply. Rotate indoor fan slowly for 1 revo-
lution or over with a screwdriver etc. from air outlet, and mea-
No
sure voltage No.2(+) and No.1(-) on CN121.
(others)
No
Does the voltage repeat 0V DC and 5V DC?
Replace the indoor power / terminal P.C. board
and the indoor electronic control P.C. board.
CN211
Resolución de averías
Figure
MAIN
AUX.
FUSE
BLK
ROTOR
BLK
RED
BLK
BLK
No
Resolder it.
Yes
267