12 volt ceiling fan stops

fmielke · 06-30-2010, 09:48 AM

He we have a 2009 Salem SMT 403FBLTD trailer which we really enjoy.
The optional 12 volt fan (not part of the air conditioner) Stops over night . Don't now how long it runs but when we get up it has stopped but the switch is still in the on position. i think that if the fan was over heating then it would restart on it's own when the thermo cut off resets but this doesn't happen. When we turn the switch off then on, the fan starts and runs for hours again.
This happens over and over.
What needs replacing? Any similar cases out there?
regards Fred

cfsoistman · 06-30-2010, 11:17 AM

Is it a Fantastic Fan? They have a temperature adjustment knob to bring the fan on when the temperature rises. The more toward the blue line the longer it runs. Our fan has 3 speeds and off. If it's set on anything other than 0-off it will cycle on and off if the top is opened.

FanTastic Vent - Products

fmielke · 06-30-2010, 11:52 AM

Hello, no it is not a fantastic exhaust fan, just a regular 4 blade 12 volt ceiling fan.

cfsoistman · 06-30-2010, 12:16 PM

Quote:

Originally Posted by fmielke

Hello, no it is not a fantastic exhaust fan, just a regular 4 blade 12 volt ceiling fan.

Maybe it has a thermal safety that kicks it off but power to the safety has to be interupted for it to reset.

fmielke · 07-26-2010, 10:48 PM

Forest River supplied a new wall switch as it was getting quite warm before it would cut out and stop the fan. The replacement switch, still gets a little warm but now the fan no longer shuts off. Also the insulation in the wall allowed for no heat dissipation. Hope the new switch will not fail.
The switch is rated at only 20 watts which I think is a little low.

LadyWindrider · 07-26-2010, 10:58 PM

20 watts at 13 volts equals 1.54 amps. Would be nice to know what the current for the fan is on high speed, which would be max current draw. Also, since it is a DC fan, are they controlling speed with resistors that are part of the switch, and do they have the proper wattage rating? The resistors may be what is generating the heat. If it quits again, turn it to high and let it run, as this should by-pass all the speed control resistors. By the way, this trick also works for the blower fan in your car.

**KyDan** · 07-27-2010, 06:27 AM

Quote:

Originally Posted by fmielke

The switch is rated at only 20 watts which I think is a little low.

Are you SURE it doesn't say rated at 20 AMPS???

**Herk7769** · 07-27-2010, 06:44 AM

Quote:

Originally Posted by windrider

20 watts at 13 volts equals 1.54 amps. Would be nice to know what the current for the fan is on high speed, which would be max current draw. Also, since it is a DC fan, are they controlling speed with resistors that are part of the switch, and do they have the proper wattage rating? The resistors may be what is generating the heat. If it quits again, turn it to high and let it run, as this should by-pass all the speed control resistors. By the way, this trick also works for the blower fan in your car.

I will get an amp reading at different speeds sometime today and post tonight.

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