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Old 01-15-2017, 04:39 PM   #1
4 Rivet Member
1955 30' Liner Commodore Vanderbilt
Vintage Kin Owner
Vintage Kin Owner
Linden , Michigan
Join Date: Jun 2014
Posts: 273
Suburban Furnace Will Not Shut Off???

I have a Suburban Furnace that will not shut off when you place the temp gage in the full low heat position (Or Off). It is a Heat Only Suburban Wall Thermostat. It use to work perfectly this fall. Yes in the past, it normally ran the blower a few minutes after I fully moved the Thermostat Control to the low or off position. Now, when I put it in the off position, the blower will eventually turn off, then it will turn on again and the furnace will dispense heat again, and again, and again. The only way that I can fully turn it off is to pull the fuse. Has anyone experienced this issue? Do I have a Thermostat issue or is in the controller on the furnace? Should I try replacing the Thermostat? Any and all suggestions would be appreciated.
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Old 01-15-2017, 06:12 PM   #2
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1986 34.5' Airstream 345
Alliance , Ohio
Join Date: Apr 2007
Posts: 250
Sounds like the thermostat. Remove the cover on the thermostat and disconnect one of the wires. Then replace the fuse you pulled. If the furnace stays off your thermostat is bad.
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Old 01-15-2017, 08:00 PM   #3
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1981 31' Excella II
New Market , Alabama
Join Date: Sep 2011
Posts: 6,130
The thermostat that comes with the furnace is crap. I bought a nice digital unit at Lowes that works great and displays the exact room temperature and it lets you set an exact temperature. Try unhooking the thermostat and see if it is fixed. You can short wires to make it run as a test.

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