Fantastic fan/electrical question

[kerry]

Fantastic fan/ electrical question: our fantastic fan is controlled by a rotating thermostatic switch attached to the rain sensor circuit board with three pins. The connection in that switch is intermittent. Anybody know how I could tap into those three pins, bypassing the thermostat with an on/off switch while retaining the rain sensor function?

 

[kerry]

I wondered that myself. It definitely activated the fan according to temperature. How would it do that it if it wasn’t some kind of thermostat?

 

[kerry]

I now think it’s a potentiometer functioning as a thermostat

 

[kerry]

I now think that the potentiometer activates a relay and it’s the relay that I can hear clicking and not making a good connection

 

[kerry]

Got it sorted. The potentiometer/thermostat/relay connects the white (ground?) wire coming into the circuit board with the green (ground) wire coming out of the circuit board heading to the motor via the direction switch. If you tap into those two wires and install a toggle switch you can turn the fan on and off independent of the thermostat. I think the board still retains its rain sensing and vent opening/closing features when you do this.

 

[kerry]

Pictures

 

[kerry]

Dometic/Fantastic Fan customer service has been completely useless in resolving this problem. They have told me to buy two different parts--one is the three speed switch which is working fine and the other is a bulb thermometer switch which was never used on this model of Fantastic Fan. This bad advice despite the fact I sent them explicit pictures of the fan and its various switches and components. Before Dometic bought Fantastic Fan they had a reputation for stellar customer service and technical help. No more.