Atwood 7920II blower not coming on

What do you have to lose.......it ain't working now so if it gets messed up you would need a new board anyway

Heat up that Iron and give it a try

Old-Biscuit wrote:
Sure.........
If you know how to solder and know/find the relay

I located the relay. Switch was open then when I jumped the blower out it made. Would I be better to replace the whole board or is it safe to say the relay is probably the issue? Soldering is no problem.

Sure.........
If you know how to solder and know/find the relay

Old-Biscuit wrote:
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

***Link Removed***

I will chech the sail switch when I get home from work. If the circuit board is bad, can one replace the relay on it instead of the whole board since I figure that's what is bad?

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