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Old 11-17-2010, 10:46 PM   #1
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Question suburban sf 30 heats beyond thermostat temp setting

I am wondering about a problem i am having with a suburban sf 30 furnace.
The prom is not with sufficient heat. instead it use to get to temperature and then click continually in the relay in the roof as well the fan would try to run and shut off. It could always supply the heat if i set the thermostat to demand more heat, failure is when it gets to temperature it was erratic. fire on off fan on off and relay in roof clicked continually. I replaced the thermostat and have cleaned all vents. Combustion smells complete.
Now the problem has gotten stranger as it acts erratically once near set temp on thermostat bu now it just keeps heating beyond set thermostat temp. I speculate the circuit board beside the furnace but could there have been a problem in the relay board in the ceiling. the trailer is a 2004 Sprinter by keystone, I'm unable to find anything similar in forums this is my first try at help as of now the furnace is out and i cleaned it and have an understanding of the wiring but and such but no way an expert by any means. I'm trying not to waste money on buying parts until i have a clue where to start and i feel i may get milked at the service center any help is greatly appreciated
Thanks from a new member

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Old 11-18-2010, 04:08 AM   #2
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Kevin, you will have to get out the multimeter when it is over heating and troubleshoot which board is acting up. It could be either. If you disconnect the blue wires and the unit keep heating it will be a bad relay. I have even found a shorted conductor to cause this problem and have to run new wiring.

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Old 11-18-2010, 05:08 PM   #3
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Thanks Rv Wizard I'll give that a try tomorrow, I much appreciate the reply!
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