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seand1109 · 04-19-2021, 08:24 PM

Been trying to install the replacement bathroom fan. It is a domestic Fantastic fan Model FA 3350. The problem I have with besides the red and black power wires, there are 2 orange wires labels wall switch. I called Dometic this morning and had to wait an hour to talk to a nice lady that when we compared old fan model number with the new fan model number, she assured me it would work. I just needed to connect the RV's 2 orange wires with two wires on the dome switch. I am trying it but no luck. The fan operates with the power wires connected but no combination of connecting the two wires at the dome switch works. Anyone have experience with this that can help me out? Thanks...

Outbound · 04-20-2021, 12:25 PM

You did not mention year and model of your motor home, if I remember correctly mine has a switch on sink cabinet along with lights water pump etc.

Podivin · 04-20-2021, 12:34 PM

Did the fan you're replacing work from a wall switch? Are the two orange wires you're referring to in the ceiling or are they on the new fan?

Outbound · 04-20-2021, 12:44 PM

Not sure, I have never had a reason to take it apart. Wall switch will also activate fan, I think in auto mode, (auto mode opens and closes vent) have not used it in a long time, I would check it but coach is in Arizona.

seand1109 · 04-20-2021, 03:46 PM

So the coach is a Beaver Contessa 2008. Yes the previous fan worked with the switches on the cabinet over the sink in the bathroom. The two orange wires are on the coach side of the problem and are marked switch wires.... they were previously connected to the old fan.

Podivin · 04-20-2021, 06:10 PM

Quote:

Originally Posted by seand1109

So the coach is a Beaver Contessa 2008. Yes the previous fan worked with the switches on the cabinet over the sink in the bathroom. The two orange wires are on the coach side of the problem and are marked switch wires.... they were previously connected to the old fan.

So on the coach you have black (ground), red (power) and two orange switch wires.
On the fan you have black and red wires.

Connect the two red wires together.
Connect the black from the coach to either of the orange wires.
Connect the other orange wire to the black wire on the fan.

You now have power wires connected together.
And ground connected together through the switch. Switch on will allow the ground connection through the switch to the fan allowing it to run, switch off will 'disconnect' the ground wire.

seand1109 · 04-21-2021, 05:36 PM

Thanks all for playing... we have a winner. The white and black are connected as before and the orange wires are are connected to the little orange wires in the dome switch. I did this with the female spade connectors on the RV's side orange wires and spliced in a second wire with a spade female connector. The Dome switch wires are very thin... smallest gage I have ever seen, so I connected the switch wires to the RV wires (both orange) with a 10 amp fuse (system is a 4 amp fused already) by sliding the female blade connectors on the blade of the fuse. Then I wrapped them with electrical tape. I then plugged the spliced in wire to the Dome switch. So to Podivin and Outbound we thank you and as for parting gifts we leave you with actual knowledge... As for me, I will enjoy the operational fan.