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Old 04-24-2011, 10:19 PM   #1
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Suburban furnace problems

Furnace worked fine all winter, but we are now in Iowa and the last cold spell the furnace would not light. Checked the limit switch and it is OK. Blower starts and sail switch closes. Can hear it spark, but furnace does not light. Voltage is over 12 volts at the unit, and I have a full tank of gas and the range top burners work fine. It is a Suburban SF 42. Anyone have any ideas on what I can check next before I yank it out and take it to a shop that can work on it?
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Old 04-24-2011, 11:38 PM   #2
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.........Before you pull it out, on the left side facing the furnace, unplug the harness from the control board, you can clean the contacts on the board with a pencil eraser, and use a paper clip on the connector. Hope it's just a bad connection, was on mine. Would not be a bad idea to blow the furnace out real good with some air. Good luck and travel safe.
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Old 05-04-2011, 09:02 AM   #3
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Furnace Problems

Follow up to my original thread. I removed the furnace and carefully labeled all the wires that stay with the coach. Took furnace to a mobile tech in the Omaha area. A new gas valve and $180 worth of labor charge, I had the furnace back and ready to install in the RV. Mine is a bit more complicated than the average as I have dual heat pumps and fan blower in the water compartment. There is a relay in the system that kicks the furnace on when it gets too cold to run the heat pumps efficiently. The tech disconnected the relay when he bench tested the furnace and then just slapped the wires back together. When I got it back and got ready to put it in, I new I was in trouble when the coach wire I labeled connect to the double red, had three red wires wirenutted together. After much confusion, I was finally able to get a diagram from Newmar that showed how the actual coach was wired. After switching almost all the relay connections and carefully double checking every color code, I got it back together. One hour job to four hours. I usually take pictures. Made the wrong assumption, that if the tech disconnected anything he would connect it back the way it was when he started.
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