28
Check of indoor fan motor
A
When the left lamp of OPERATION INDICATOR lamp blinks 3 times and the right lamp of OPERATION INDICATOR
lamp is not lit
Indoor fan does not operate.
If more than 12 seconds pass after EMERGENCY OPERATION switch
is pressed, the voltage mentioned in above 2) goes 0 V DC although the
indoor electronic control P.C. board is normal.
Pay attention to the high voltage on the fan motor connector CN211.
Yes
No
No
(Changed)
Yes
(Unchanged)
Is there anything that interferes the
rotation of the line flow fan?
Turn OFF the power supply.
Remove the object and
adjust the line flow fan.
Turn ON the power supply, wait 5 seconds or more, and then press
EMERGENCY OPERATION switch.
Measure the supply voltage as follows within 12 seconds
after EMERGENCY OPERATION switch is pressed.
If more than 12 seconds passes by, turn OFF the power supply and
turn ON it again, then measure the voltage.
1) Measure the voltage between CN211 (+) and (-).
2) Measure the voltage between CN211 (+) and (-).
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 (-) while the fan
motor is rotating.
Is 0 V DC or 15 V DC
held unchanged?
Replace the indoor fan motor.
Replace the indoor electronic control P.C. board.
The indoor fan motor error has occurred, and the indoor fan does not operate.
No
No
Is there 294/325 V DC
between CN211 (+)
and (–)?
Yes
Yes
Replace the indoor fan motor.
Replace the indoor electronic control P.C. board.
Does the voltage between CN211
(+) and (–) on the indoor electronic
control P.C. board rise to the range of
3 to 6 V DC within 12 seconds after
EMERGENCY OPERATION switch
is pressed?
9-6. TROUBLESHOOTING FLOW
CN211
Indoor electronic
control P.C. Board
C111
OBHT802
