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Old 10-07-2011, 12:46 PM   #1
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Question Duo Therm problems

Hi, I have an old 1987 Duo Therm furnace in my kit companion travel trailer. It will cycle and work fine for about two to three hours. Then it fails to ignite and the combustion motor continues to blow cold air until I shut the furnace off. If I wait three hours or so the furnace will then operate well for another two hours. The furnace is old but it has had very little use. The intake fresh air and outlet vent is clear to the unit and the propane supply is not an issue. I don't think it is a limit switch because the unit cycles properly and does not appear to get too hot when it is running well. Any suggestions? Thank you for any help!

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Old 10-08-2011, 07:59 AM   #2
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Check the burner.

One in our 89 GBMC had the same issue before. I ran down all the other options before discovering it was bad. Seemed strange that it worked for a while and then stoped, but it solved the problem.

You will have to unhook the propane line, remove the exhaust tube, unplug some wires and take out 5 (I think) screws to get the propane valve out with the burner attached to it.

Mine was blown apart, with a large hole in the middle.

New, it should look something like this:
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Mike and Carla
1998 42' Overland Larado Diesel Pusher
On the road - here and there - Full Timing
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Old 10-08-2011, 07:03 PM   #3
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Sometimes low voltage will cause the fan to run slow, which in turn causes the sail-switch shut off the LP. Make sure your house battery is good and fully charged, and all wire connections are clean with good contact.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution. "Abraham Lincoln"
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