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Old 01-23-2016, 02:13 PM   #1
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Furnace issue HELP !!

Hi All,

2004 Winnebago Adventurer

Does anyone know where is fuse / relay is for the furnace is ?

Got up this morning to mid 30's AHH found out the furnace wouldn't turn on.
I've discovered that the furnace is working ok, I've managed to by-pass the thermostat and got the unit to turn on.

When I checked the power to the unit i was getting 13V. But when we try turn the unit on using the thermostat the middle wire only goes to 0.08v. ( once I connected 12v to this connection it started working.

HELP !!!
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Old 01-23-2016, 05:18 PM   #2
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how are your batteries ? Normally the thermostat wire goes direct to the furnace.
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Old 01-24-2016, 04:58 AM   #3
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I had same problem yesterday.Checked batteries,ok.Went out side saw some white film on the spade connectors.pulled them off cleaned them up,also turned blower switch that is mounted on motor off and on several times. Everything works fine.Not sure what it was .
Had this problem once before ,dry camping it was battery volt,blower would turn on then shut off in about one min.We use a lot of solar, installed auto generator start 50% on house batteries or 12.7 v.
keep us posted as to what you find.
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Old 01-24-2016, 06:13 AM   #4
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Most furnace problems are caused by bad connections.
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Old 01-24-2016, 06:37 AM   #5
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I had that problem, Hydro Hot blowers would not turn on. Pulled blower fuse, put back in and it worked. Dirty connection I guess.
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Old 01-24-2016, 08:10 AM   #6
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Thanks

Greg, where is the blower fuse ?

Update:
I have it running.... Kind of
By manually joining the hot and the t-stat wires together at the t-stat I can get it to run.
When you take off the tstat panel, behind it you'll find 2 connectors. The one with 3 wires is the furnace.
Red +
Blue -
White furnace on/off
Once I gave the white wire power, it turned on

So we've ordered a new tstat ( believing that's the problem )
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Old 01-24-2016, 08:50 AM   #7
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It sounds like a thermostat problem...
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Old 01-24-2016, 10:02 AM   #8
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You already established that your furnace works, so don't waste time on blower motors and furnace fuses. Your problem is the power to the thermostat, or the thermostat itself. Focus your diagnostic energies there, starting with the power wire behind the thermostat.
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Old 01-25-2016, 08:06 AM   #9
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Quote:
Originally Posted by Publin View Post
Thanks

Greg, where is the blower fuse ?
Sounds like you are on the right track... Just so you know, the 12V fuses are located in a couple of boxes underneath the 120V circuit breakers in an electrical cabinet somewhere in your coach. Mine is in the hallway aft of the galley.
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Old 01-25-2016, 08:44 AM   #10
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Thanks Greg

I thought that was them !

We've order a new tstat hope that fixes it. Will update once I have it installed.

Thanks all for the advice and help
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