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Old 10-01-2017, 10:22 PM   #1
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1986 32' Excella
San Jose , California
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Suburban Furnace Problem

I have an '86 32' Excella where I installed a new furnace, a Suburban NT-30SP. I put in a new unit, then warranty replaced a new circuit board, and now am on another entirely new unit. The same thing keeps happening to it: install, turn on the 'on' switch on the right side by the wiring harness, turn on gas, set temp at thermostat and the furnace blows and fires and turns off when the temperature is met. However after approximately 30-45 seconds after shutting down, the furnace makes an audible click and won't blow, turn over or reignite. I bypassed the thermostat and crossed and didn't have any power. I then turned the furnace switch off and then on again and waited without turning the heat on and the furnace clicks on when switched on but then clicks and turns off again after 30-45 seconds. Every time the furnace clicks and turns off there is no power to the thermostat on the wall at the back of the trailer. On a side note, the only electrical I have touched or replaced is the converter; I installed a new BD 1260C Boondocker BD1260C (60 Amp 4-Stage Converter/Charger). Any thoughts on what is going on? Circuit Board? Fuse?

Thanks,

Charlie
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Old 10-02-2017, 04:22 PM   #2
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1986 32' Excella
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* I bypassed the thermostat and crossed the blue wires and didn't have any power. *
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Old 10-03-2017, 03:59 PM   #3
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Sounds like a high temperature limit switch. If so it will need to be manually reset.
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Old 10-03-2017, 05:44 PM   #4
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1986 32' Excella
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- what do you mean by manually reset? Replace the switch? Or adjust the limit on it? I didn't think those switched were adjustable.
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