Atwood 7920II blower not coming on
Blower isn't coming on, and led starts flashing one time. I checked voltage to the motor when I get a click no voltage but have voltage on the red wire below it. I think the control board is the issue...
Forum Discussion
DC+ from a fused source goes to circuit board 'PWR' connection
*also the source of the DC+ to thermostat
When thermostat closes that DC+ comes back and goes to circuit board multi-pin connector
*also goes to Sail Switch
When circuit board gets that DC+ from the thermostat it sends DC+ to Fan Motor from the 'BLO' connection on circuit board
Got DC+ to 'PWR' on Red Wire
Get DC+ on Blue Wire at the multi-pin connection
No DC+ on Red Wire from 'BLO' to Motor
*Could be Circuit Board
*Could also be Sail Switch stuck Closed...Circuit board will not allow fan operation if Sail Switch is Closed BEFORE Fan runs
See pg 4 for wiring diagram
*also the source of the DC+ to thermostat
When thermostat closes that DC+ comes back and goes to circuit board multi-pin connector
*also goes to Sail Switch
When circuit board gets that DC+ from the thermostat it sends DC+ to Fan Motor from the 'BLO' connection on circuit board
Got DC+ to 'PWR' on Red Wire
Get DC+ on Blue Wire at the multi-pin connection
No DC+ on Red Wire from 'BLO' to Motor
*Could be Circuit Board
*Could also be Sail Switch stuck Closed...Circuit board will not allow fan operation if Sail Switch is Closed BEFORE Fan runs
See pg 4 for wiring diagram
