Aqua Hot heat exchanger fan not working

[John Sinnar]

I have one heat exchanger fan that is not getting voltage when the aqua hot is on. Does anyone know where the 12 volts comes from and ideas where to check..............?
thanks,

john sinnar
06 Thundermobile

[David T. Richelderfer]

Last Summer the furnace fan located on the floor under the dash between the pilot and co-pilot's seats would not push air.  I checked the fan speed toggle switch.  The fan would not operate with the switch on low or hi.  I assumed the fan's motor was kapunked or power to the fan had been lost.  It turned out to be a nylon tie had been dropped on the floor under the dash by either a prior owner or service technician.  The nylon tie had moved, I assume by road vibration, into the squirrel cage fan and totally stopped its rotation.  The fix was easy, but getting into it to discover and remove the nylon tie was a PITA.

[Gerald Farris]

John,
You will probably need to check with one of the Aqua Hot techs like Orman, but I think that the fan gets it's power source from the Aqua Hot control board.

Gerald

[Steve Huber Co-Admin]

John,
Gerald's correct about the 12v source. However, if there is another fan in the heating zone, e.g main living area, and the other fan runs, I'd suspect the problem  is at the specific fan motor, switch, or connections. If there is only one fan in zone that is not operating, it could also be the thermostat.
Steve

[Jerald Cate]

John,
There is an Aqua Hot owners manual in the Members Only Section, Coach Assist Link.  Don't know if it's the same model as yours but it may aid in your troubleshooting.

Bruce