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Old 03-17-2019, 07:44 AM   #1
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Suburban furnace

Our furnace went out on the coldest night in Jacksonville in January. Thought it was out of L.P. but filled tank and still did not think it was a fuse. Checked fuse and it was melted. Did not replace it. Have RV in shop for that and some other problems (110 power cord reel stopped, slide topper needs replaced). Have never used this repair shop so want to make sure they check everything. Nothing else was running when furnace went out during the night and was strictly running on DC voltage. The batteries are 6 months old. What could cause a fuse to melt? I noticed since we bought this RV (2004 Newmar DS) and used the furnace, it would start up momentarily, stop and restart seeming to hesitate. Kept meaning to check out motor and capacitor but never got around to it. Would that have caused the fuse to melt? Have found out the hard way that you should know all possibilities before allowing replacement or repair. Can the blower motor be replaced without the whole furnace? Thanks for your time. I really feel empowered when all of you experts educate me. Thank you.
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Old 03-17-2019, 07:48 AM   #2
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Melting fuse would indicate high resistance probably due to corrosion where it plugs in.
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Old 03-17-2019, 08:15 AM   #3
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suburban furnaces are well know for failing motors. normally the motor gets really noisy first then burns out the fuse, but no guarantee of the noise. I fire mine up once or twice during the summer months to burn the dirt off the burner manifold. Another common problem is critters building nests in the exhaust manifold and putting a heavy load on the motor causing the fuse to burn. yes, the motor can be replaced with out replacing the entire furnace. motors are on amazon for less than $100
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Old 03-17-2019, 08:19 AM   #4
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That's why they make screen covers....
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Old 03-17-2019, 09:13 AM   #5
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As mentioned, a poor connection caused by corrosion can cause a fuse to melt. So can over current. Not enough over to blow the fuse, just enough to cause it to overheat and melt the plastic. And the fuse might be under rated for the job...a design error. Like it needs a 15 amp fuse, but engineering only spec'ed a 10 amp. Then of course, a low battery voltage can cause a higher current and overheating. A bad motor can sometimes have a few shorted windings and might over current, but that would be rare in my experience.

So, check things in order and repair as you go.

First thing I'd do is check the manual to make sure I put the right fuse back in. Then check how tight the fuse connectors are now that they've been overheated. And if possible replace them if they are discolored.
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Old 03-18-2019, 10:29 AM   #6
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We checked for critters and none found. Will have to find where the plugin is located to check that. It looks like the fuse block where it melted may have melted some of where the fuse connects. Glad to know blower motor can be replaced separately. Waiting to hear from shop when they will be done with body work and will start one at a time checking furnace. Great replies. Thank you. Will let post what we found.
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Old 04-04-2019, 07:11 AM   #7
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UPDATE: It was found that there was a bad connection in the fuse block that caused the fuse to overheat and melt.. The furnace was removed and bench tested and all was okay. Glad they checked the furnace even though it cost a lot more than just replacing the fuse. Our last motorhome burned up and we are very cautious now with anything that lights up. The technician rewired the furnace to another fuse in the block.
Thanks again to all of you for your help.
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