Service manual

13-11
TROUBLESHOOTING
SM CINCO 1-A.1 GB
13.5.7 Checking Outdoor Fan Motor
This type of fault may occur during very high winds outdoors that may stop the fan rotation for short periods. If so, need
to relocate the outdoor unit to a more protected place from winds or install measure of air deflection in front of the fan
outlets.
Check OFAN connections - Repair if needed.1)
Rotate the fan slowly by hand - If the fan does not rotate easily, check whether something is obstructing the fan 2)
preventing it from rotating – remove the obstruction if necessary. If no obstruction and still not operating - the fan motor
bearings have seized - Replace the motor.
Disconnect the OFAN connector from the main board, switch ON the power and check the fan motor connector on the 3)
main board:
Between 1 and 3 – should be 310VDC. If very low or 0VDC, replace main board.a.
Between 3 and 4 – should be 15VDC. If very low or 0VDC, replace main board.b.
Between 3 and 6 – should be 15VDC. If very low or 0VDC, replace main board.c.
Connect back the motor connector to the main board, switch ON the power and check the motor current while operating. 4)
Current should be around 1A - In case of abnormal current (no current or excessive current), replace fan motor.
Replacing outdoor unit fan motor - (14.1.17)
Replacing main board - (14.1.13)
15
OFAN_UP
OFAN_DN
4
3
1
2
3
6
5
4
OFAN_UP
OFAN_DN
1
2
3
6
5
4
15
3
6
M
1
RED
1.0
3)b Check motor command voltage 4) Check motor current
1
OFAN_UP
OFAN_DN
3
4
5
6
3
2
1
310
3)a Check motor supply voltage 3)c Check motor command voltage