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Old 10-02-2011, 12:38 PM   #1
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Mobile Home Furnace Problem


I have a mobile home with an electric furnace. Now I have a fan switch that is bad. BUT, when I hardwire the wires together, the fan obviously turns on, but blows cold air. Is there another problem? Or will the fan switch fix this also?

The fan switch when bad last year also. Had a tech come in to diagnos but, found nothing but the fan switch. Any help would be greatly appreciated.

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Old 10-02-2011, 05:30 PM   #2
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Mobile Home Furnace Problem


Could be a heat sequencer is bad.

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Old 10-02-2011, 06:46 PM   #3
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Mobile Home Furnace Problem


Where would that be located?
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Old 10-02-2011, 08:51 PM   #4
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Mobile Home Furnace Problem


What is this fan switch that is bad?
Is it the fan relay, or the thermostat?
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Old 10-02-2011, 08:58 PM   #5
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Mobile Home Furnace Problem


There has to be a relay,contactor,sequencer ,something that puts line voltage to the heating elements and or fan.
This usually has a low voltage coil that the stat energizes on a call for heat.
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Old 10-02-2011, 09:06 PM   #6
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Mobile Home Furnace Problem


sequencer sound to be that problem or limit. also need to find what took it them out. I can be dirty filter or even plugged coil if has a/c.
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Old 10-02-2011, 09:56 PM   #7
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Mobile Home Furnace Problem


It does have AC.

and this is the part thats bad

well, thats what I noticed first. Didn't check the switch next to it

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Old 10-02-2011, 10:03 PM   #8
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Mobile Home Furnace Problem


That's a thermal fuse.
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Old 10-02-2011, 10:04 PM   #9
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Mobile Home Furnace Problem


Quote:
Originally Posted by Master of Cold View Post
That's a thermal fuse.
So, this when this switch is plugged in, the fan does not turn on at all. When I hardwire the 2 wires together, the fan pops on, but blows cold air. What does this switch do>?
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Old 10-02-2011, 11:16 PM   #10
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Mobile Home Furnace Problem


That is not a fuse,its a switch.It is normally open,when it senses 110 degrees it makes the circut,when it then senses 90 degrees it opens again.
There very well could be a fuse in line with the heating elements that would have opened if the fan didn't come on to cool the plenum.
You really need a meter to check electrical systems out.
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Old 10-03-2011, 08:25 AM   #11
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Mobile Home Furnace Problem


Can you take a picture of the actual switch, and the wiring in the unit..something here is not right.
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Old 10-14-2011, 03:45 PM   #12
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Mobile Home Furnace Problem


Finally got time to pick up a new switch. Plugged it in and the fan doesn't even turn on now.

Do I need to wait for it to heat up or something before it turns on?
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Old 10-14-2011, 03:51 PM   #13
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Mobile Home Furnace Problem


Quote:
Originally Posted by colu41 View Post
Finally got time to pick up a new switch. Plugged it in and the fan doesn't even turn on now.

Do I need to wait for it to heat up or something before it turns on?
Perhaps you missed my first reply.
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Old 10-14-2011, 03:56 PM   #14
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Mobile Home Furnace Problem


Quote:
Originally Posted by REP View Post
There has to be a relay,contactor,sequencer ,something that puts line voltage to the heating elements and or fan.
This usually has a low voltage coil that the stat energizes on a call for heat.
This?

So what am I looking for?
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Old 10-14-2011, 04:18 PM   #15
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Mobile Home Furnace Problem


Post pic of inside of the furnace where the wires connect.

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