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Old 06-26-2013, 10:08 PM   #1
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Furnace run with AC on.

Ok what did I do? Had a tough day at work so I decided to tackle my next mod. I installed my progressive industries 30 amp hardwire kit with remote display. Everything seems to have went well. However now, when I turn on the AC the Furnace also turns on and blows heat?! I don't think I screwed anything up. I had the shore power off and the battery disconnect turned off. Everything else in the camper seems fine. Please someone give me an idea of why this would happen before the DW gets home.


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Old 06-26-2013, 10:15 PM   #2
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Check to see if your fan selection is in the 'On' position instead of 'Auto'.

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Old 06-26-2013, 10:17 PM   #3
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Nope. This is what the thermo looks like. Of course before I turn the switch to cool.

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Old 06-26-2013, 10:24 PM   #4
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I also tried pulling the fuse for three minutes to see if it just needed to be reset. Saw that in another thread about a furnace not turning on.

Last bit of useful info is I tried to turn the furnace on by itself and the AC did not turn on. This is weird.
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Old 06-26-2013, 10:28 PM   #5
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I can't imagine that installing the surge protector would have any bearing on your problem...it's got to be in the thermostat control wiring.

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Old 06-26-2013, 10:35 PM   #6
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Is that anywhere near the power supply for the camper? Maybe knocked a wire loose? Or shorted out? I don't see anything.

I really wanted to go camping this weekend.
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Old 06-26-2013, 10:41 PM   #7
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Have you tried to operate the AC fan in manual 'On'?

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Old 06-26-2013, 10:45 PM   #8
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Also I'd pop off the thermostat cover and look for loose wires or connections.

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Old 06-26-2013, 11:18 PM   #9
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Quote:
Originally Posted by Feldhege
Is that anywhere near the power supply for the camper? Maybe knocked a wire loose? Or shorted out? I don't see anything.

I really wanted to go camping this weekend.
Sounds like the heater lead an the a/c lead have shorted togrther in the thermostst control unit or in the leads leading to the thermostat. Meatime pull the fuse on the one you don't want.
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Old 06-26-2013, 11:35 PM   #10
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Well the furnace and refrigerator are on the same fuse according to the panel. That won't work.

So I tested it and the furnace will run fine on its own. If I just turn the fan on, the AC blower will work fine. Turn it to cool and the furnace kicks on seconds after the cooling begins.

The wires look fine on the thermostat and the power center. Also the thermostat is on the left of the camper with the furnace below it. The AC is on the roof of course. The power center in on the right side of the camper and I mounted the surge box behind it. I may have to see if I can take it to the dealer.
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