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Old 08-18-2021, 08:39 AM   #1
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Suburban heater

Been having trouble with my heater and think I narrowed it down to the control board
Replaced it with a Dinosaur board. We are in Colorado mountains and using it to knock out the morning chills
Been working ok for about a week, now it sometimes tries to come on and acting up. Just now fan came on for maybe 3-4 sec and cut off. Did this 3 times and quit. Finally I raised the thermostat 2deg and heater seams to work fine
Not sure I have heater problems or thermostat problems. Iím using a Domestic digital one. All heater items new. Sail switch, high heat cut out all replaced before new board. Your thoughts
All help appreciated
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Old 08-18-2021, 08:58 AM   #2
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Digital thermostat may be a little too sensitive. I would give it a try for awhile at your new 2 degree setting and see what happens.
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Old 08-18-2021, 09:27 AM   #3
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Without knowing your particular furnace model, most of this is guessing.

Here is a link to service manual for various furnace models. A troubleshooting diagram is found, starting on p. 30.
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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Old 08-18-2021, 08:09 PM   #4
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It is just a switch
Raising the set point 2 degrees just changed the range t-stat closes
Didn't change furnace functions

Is it time for YOUR Medication or Mine?
Dodge 3500 w/Tractor Motor & NUWA 5vr
US NAVY---USS Decatur DDG-31
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Old 08-21-2021, 02:11 PM   #5
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Suburban heater

Had a problem in a fifth wheel with this type of heater. Turned out the propane regulator was defective. I was able to turn it up to obtain 10.5 inches of water and it worked. I had a gauge that I could measure the pressure. Something you might consider. Travato john
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Old 08-21-2021, 03:42 PM   #6
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Just finished finding the source of a similar problem with my suburban furnace.
The furnace would start - blower engage - for a few seconds, then stop. A few seconds later, it would start again and more often than not keep running. Eliminated the thermostat as the problem by simply connecting the two thermostat wires together (as Old Biscuit noted). Suspected a sail switch, so pulled the furnace and removed the cover.

On the work bench, the furnace worked fine for several cycles, then quit working all together. Sail switch checked out. but the wire to the blower motor did not show voltage from the relay. First thought was a short n the blower motor, but when I pulled the positive and negative to the motor and applied power, the blower worked. Turned out the ground connection was loose. Proved the old adage that 90% of intermittent problems with DC is a poor ground. The ground for the motor is a blade connection on a ground bus bar at the bottom of the furnace. Vibration and time must have loosened the connection. IF it isn't your thermostat, take a look at the ground connections.
Jim & Lin
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heat, heater, suburban

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