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Old 04-10-2015, 10:04 PM   #1
Junior Member
Join Date: Apr 2015
Posts: 7
Suburban furnace 42T

we just got a 36' komfort 5th wheel
so far every thing works except the furnace
the fan will run but no clicking noise for lighting
full propane tank and shore power.
I tried vacuuming it out
but it is really hard to get to tucked away under the bathtub
so I think I am going to crawl into the tiny space
and disconnect it and drag it out
THEN I will clean it up and take a crash course in old rv repair and maintenance
(that means lots of web surfing and YouTube)
I don't even know how to use a multi meter so I will be busy

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Old 04-11-2015, 08:09 AM   #2
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Join Date: May 2013
Location: Aransas Pass, TX
Posts: 255
Here's a good source for a manual for your furnace. Should be a troubleshooting guide in there as well.

Sounds like you have 12 volts to the furnace, since the fan runs, but no ignition, so it could be something as simple as a bad or blocked igniter.

If you pull the old furnace out, you might also consider replacing it with a catalytic or blue flame heater; enormous saving of propane and battery power (important if you're boondocking, even overnight).

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Old 04-13-2015, 07:58 AM   #3
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Join Date: Nov 2014
Posts: 304
Could be a bad sail switch assuming you have adequate airflow from the fan.
1997 Newmar Mountain Aire 3757
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Old 04-14-2015, 04:02 PM   #4
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Join Date: Apr 2015
Posts: 7
there was a big honkin mud dauber nest in and around the squirrel cage fan thing.
i am going to read how to clean the jet (or whatever) and then hook it back up to test
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furnace, ace

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