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Old 01-10-2011, 07:25 PM   #1
KRS
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Dometic furnace and fridge both quit working- blowing fuse

Good evening everyone,

This is my first post (just found the forum). I'm caretaking my folks travel trailer and truck, they leave it here so it's ready when they need it.

Everything has been working fine until the other day. The fridge would not turn on and the furnace wouldn't turn on.

I checked the little fuse panel inside the TT.

The 25 amp furnace fuse was blown. Replaced it with a new one. Bled propane lines using a burner on the stove top to be sure propane was near furnace. Turned on heater switch on wall, lowered temperature to where it should come on and fuse blows.

The TT has two compartments for the fridge / furnace, one inside and one outside. The inside one doesn't have much in it, just appears to be burner tubes. The outside one appears to be all fridge related.

What should I check?

Also, does the furnace have it's own blower motor or does it use the roof mounted A/C blower? The reason I ask is that I turned the thermostat to fan only and the fan came on, so it works.

Thank you for your help, I appreciate it. I have basic tools and a radio shack multi-meter. I'm no expert by any means but I can check anything that I need to. Thank you.

KRS
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Old 01-10-2011, 09:25 PM   #2
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Well, I can't help much, but hang there. help will come. As for the furnace, all I know of have their own fan, don't use the AC fan, but I'm no expert. It would help greatly if you posted the year, model, etc. of the travel trailer. We also need to know if if it is plugged in to shore power. If not, it needs to be. After one cold night, with the furnace running, the battery may be low. Check battery voltage. First place to start anyway. Somebody else will be along. If all else fails, get it plugged to shore power and put an electric heater in it to keep pipes from freezing.
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Old 01-10-2011, 10:17 PM   #3
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Fuse blowing would tell me that the furnace fan motor is probably bad. Turn the furnace off and see if the fuse works with the refer on. BTW the refer will work on 120VAC or gas. But if must have 12VDC to run on gas. So you must have fully charged batteries before either will run. Now, does the refer start and get cold after a few hours? Yes, then shut down the refer and try the furnace. Did it blow the fuse? Yes, then you have isolated the issue to the furnace. Like I said I would suspect the furnace blower motor.
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Old 01-10-2011, 10:28 PM   #4
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Thanks guys, it's an '04 Wildcat 29BHS (in my signature).

It's on shore power (and has been for a month). Dual batteries.

I checked the fridge on propane... let me check it on electric too.

Have a good night!

KRS
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Old 01-11-2011, 06:35 AM   #5
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Welcome to Forest River Forums!!

In my trailer the thermostat "fan only" or "fan on"
setting refers to the AC roof unit.
It doesn't say that but that's what it does.
Sounds like yours is the same way.

Blowing the fuse as soon as the furnace tries to come on
could mean a stuck furnace blower motor.
Birds nest, wasp nest, or just sticky motor bearings
could do this.
IF you can safely open up the furnace enough to get
a screw driver to the blower, give it a nudge and see
if it spins freely. It MIGHT be something as simple
as a needed shot of WD40 or a drop of motor oil.

It might be a melted wire. The furnace has sharp
edges and hot surfaces. A slightly out of place wire
could be cut or melted thru causing a short.
This would be my guess on a new unit.

On yours I'm betting the blower motor is stuck or jammed.
Give it a spin if you can. See what happens.....
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Old 01-11-2011, 07:06 AM   #6
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On mine, the furnace and the blower, and all of the ducting work is separate from the roof mounted and ducted AC. The refrigerator has a couple of fuses underneath the plastic outside cover, one for 12v, and one for 120v. They are the old school glass fuses (tubular.) Under the plastic cover, there's another metal cover plate held on with 2 screws, I think. Once removed, you'll see those fuses. Just a possibility that's the problem. Be patient, also. It does take these RV fridges a LONG time to cool- check the freezer side in about 2 hours. Randy
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Old 01-11-2011, 07:39 AM   #7
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Put the fridge on electric last night, going to check it this morning.

I can't seem to find where the furnace fan assembly would be located. It must be buried somewhere....
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Old 01-11-2011, 07:53 AM   #8
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To locate your furnace go outside the trailer and look for
something that looks like this then go inside and look
in the same area.
(inside a cabinet or behind a grille or removable panel)
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Old 01-11-2011, 07:53 AM   #9
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Fridge on electricity worked great, cold this morning.
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2004 Forest River Wildcat 29BHS
15.0 BTU ducted roof air
Tow vehicle: 2006 Dodge 3500 cummins turbo auto
Cummins exhaust brake
Air bags
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Old 01-11-2011, 07:54 AM   #10
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KyDan, I found that vent, and there is a panel inside. But the panel reveals the burner tubes. Didn't see a fan in there. I'm looking for a 'squirrel cage' type fan, right?

KRS
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