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Old 12-05-2011, 12:51 PM   #1
2 Rivet Member
1976 31' Sovereign
1963 16' Bambi
1971 21' Globetrotter
Marbletown , New York
Join Date: Feb 2006
Posts: 51
Furnace Problem

I am having trouble with my 2 year old Suburban furnace. It worked fine for about a year. Recently I tested it before it got too cold and it didn't go on. I took it to the nearest Suburban dealer and he replaced the "board". I re-installed it and it worked for a week or so. Two days ago I turned the furnace on and set the thermostat at about 55. I was working outside and after about 45 min. I came back in to warm up. The furnace was off. I tunned the furnace off at the therm. and then set it again at about 55 again. It lit and warmed up. I went outside again and came in to find the furnace off and the inside temp at 40 degrees. The process with turning the furnace didn't work and so I flipped the circuit breaker off and then on (it was not trippe and didn't trip)

Now I have to use either technique above to get it going but it still doesn't get up to temp. before it shuts off.

It seems as though it will operate when some sort of electrical surge takes place.

Any ideas?

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Old 12-05-2011, 03:06 PM   #2
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1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,899
Images: 12
Go in the trailer and set the thermostat to 70 degrees. If the fan comes on within 20 seconds or so stand at the unit and count seconds to 20 within that 20 seconds you should hear a click. If you hear a click the main gas valve has opened and the heater should work. If this is the case I would not rely on the thermostat as a means of setting the temperature. They are not that accurate.

If you did not hear a click I have to ask. Have you had the gas bottles off since the heat last worked as expected? If so you may have air in the lines and the heater will not purge that air. At the heater crack the gas line till you smell gas and then tighten the gas line and try lighting the heater again.

If this works I doubt there was anything wrong with the board. Dealer like to change them because of the cost.

2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

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Old 12-05-2011, 05:25 PM   #3
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Mike Leary's Avatar
1983 31' Airstream310
Cactus Hug , Arizona
Join Date: Mar 2007
Posts: 2,540
Images: 11
Did the furnace continue to blow cold air?
"A settled wisdom, plus the itch to be elsewhere"
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Old 12-05-2011, 06:30 PM   #4
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1995 30' Excella
Logan , New Mexico
Join Date: Feb 2005
Posts: 90
Are you plugged into shore power or are you trying to run the heater off your batteries?
Charles & Annette
WBCCI # 1407 -- Member 4CU
1995 31' Excella
Dodge 2500 Diesel-Tow Vehicle
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