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9-6. TROUBLESHOOTING FLOW
A Check of indoor fan motor
MS-CP13VA
The indoor fan motor error has occurred, and the indoor fan does not operate.
Turn OFF the power supply.
Is there any foreign matter that interferes
the rotation of the line flow fan?
Remove the foreign matter and
adjust the line flow fan.
Is there 311-325-339 V
DC between CN211
(+) and
Replace the indoor power
P.C. board.
The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.
Measure the voltage between CN211
(+) and
rotating.
Replace the indoor power P.C.
board.
OBH782A
No
Yes
Yes
(–) ?
No
Yes
(–) while the fan motor is
Yes
(Unchanged)
Pay enough attention to the high voltage on the fan motor connector CN211.
Turn ON the power supply, wait 5 seconds or more, and then press Emer-
gency operation switch.
Measure the supply voltage as follows within 12 seconds after Emergency
operation switch is pressed.
If more than 12 seconds passes, turn OFF the power supply and turn it
ON again, then measure the voltage. *
<Indoor power P.C. board>
1. Measure the voltage between CN211
2. Measure the voltage between CN211
<Indoor electronic control P.C. board>
3. Measure the voltage between CN10A
*If more than 12 seconds passes after Emergency operation switch is
pressed, the voltage measured at 2. above goes 0 V DC although the indoor
P.C. board is normal.
Does the voltage between CN211
(+) and
(–) on the power P.C.
board rise to the range of 3 to 6 V DC
within 12 seconds after Emergency
operation switch is pressed?
No
Does the voltage between CN10A
(+) and GND (–) on the indoor
electronic control P.C. board fall to
2 V or less within 12 seconds after
Emergency operation switch is
pressed?
Is it unchanged holding 0
or 15 V DC?
No
(Changed)
Yes
(Unchanged)
Replace the indoor fan motor.
Is it unchanged holding 0
or 5 V DC?
No
(Changed)
28
(+) and
(–).
(+) and
(–).
(+) and GND (–).
Replace the indoor fan motor.
Yes
Replace the indoor electronic
No
control P.C. board.
Measure the voltage CN10A
(+) and GND (–) on the indoor
electronic control P.C board when
the fan motor is rotaring.
Replace the indoor
electronic control P.C.
board.
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