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Old 03-05-2019, 08:13 PM   #1
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Location: GLEN ALLEN, VA
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Fuse for Suburban Furnace

I am having issues with my Suburban SF35 furnace. I have had the sail switch, electrode, blower motor and control board replaced. Today it won't start. No fan, no nothing. Went to bed and it was working fine. Woke up to no front furnace. Rear furnace is working perfectly, so I know it is not the LP. All the things I have read say...check the fuse. my question....WHERE IS THE FUSE? I know I have 12 volt fuse box above the refrigerator but how do I know which fuse is for the furnace? I have a 1999 Fleetwood Bounder S36. I hate to call the mobile RV guy to come back just to replace a fuse but I am lost. Thanks for any help you can offer.

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Old 03-05-2019, 08:58 PM   #2
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First take your meter and test to see if you have 12V at the furnace. If you don't then look for the fuse but if you do have the 12V then start figuring out what's wrong with the furnace.

Have you got an owner's manual?

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Old 03-05-2019, 09:11 PM   #3
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We have a 2000 Bounder with the same above fridge fuse panel, poorly mis-labeled: should only be ten fuses, pull and check them or test in place. Then one day spend a few hours testing and labeling the panel ( it on my to do list too).
2000 Fleetwood Bounder 34D
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Old 03-05-2019, 09:29 PM   #4
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Chances are your furnace is on a circuit with 2 or three other 12 volt items Range hood, refrigerator, etc. Either other things are out or there is a bad connection someplace. As stated, check the voltage at the furnace. My 02 5er has the furnace, fridge, range hood and WH on the same circuit.
2011 Keystone Sprinter BHS. Port Charlotte Fl/Hinsdale MA. Retired Master Electrician. All Motor homes are RV's. All RV's are not Motor homes.
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Old 03-06-2019, 07:25 AM   #5
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The fuse is not in the furnace itself - it is part of whatever 12v circuit the RV maker used to power the furnace. Could well be shared with other uses. Hopefully it's in that fuse panel you mentioned, but sometimes the factory just sticks it inline somewhere.

The first step is to get a voltmeter or 12v test light and check at the furnace for +12v on its power line. If you have 12v there, no need to search for a fuse. Be aware there are two +12v lines to the furnace, one the primary power and the other the "heat needed" signal from the thermostat. If the thermostat signal isn't present, the fan won't start and nothing happens. It's possible your problem is the thermostat or its wiring.
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Old 03-06-2019, 10:10 AM   #6
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If you get tired of never having a fuse......these are resettableClick image for larger version

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2010 Rockwood Sig Ultra lite 5er 8280......'99 Ram 2500, Cummins. 4x4.....Pullrite Superglide.......Use to work in calender factory.....got fired for tak'n a few days off.....
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Old 03-06-2019, 10:15 AM   #7
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

There should be a sheet showing the 12VDC fuses and what they control. Maybe someone who has the same rig will see this and help! Have fun and keep her between the ditches!

Good luck, happy trails, and God bless!
Joe & Annette

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Old 03-06-2019, 09:04 PM   #8
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Originally Posted by MSHappyCampers View Post
There should be a sheet showing the 12VDC fuses and what they control.
In an ideal world, yes.
2017 Berkshire 38A
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Old 03-06-2019, 10:34 PM   #9
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As stated above a multi tester is a great tool to have. Fleetwoodrv.com is a great place to request all your mechanical drawings. I received mine by email in less than 48 hours. A must have if you are going to do a lot of your own repairs. Good luck
2007 Bounder 38S diesel towing a 2006 Suburban 2500 4x4
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Old 03-07-2019, 08:01 AM   #10
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You are correct about Fleetwood. Last winter I needed a plumbing drawing and they emailed it immediately. Thanks!!

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ace, furnace, fuse, suburban

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