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View Diary: Saturday Morning Home Repair Blog (122 comments)

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  •  Turn it all the way on (9+ / 0-)

    turn it as high as it goes and see if the furnace lights and stays on. If it does, its most probbaly, almost certainly the thermostat. If it doesn't there's something besides the thermostat, tho the t might also be out.

    Happy just to be alive

    by exlrrp on Sat Dec 22, 2012 at 08:04:37 AM PST

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    •  One more thing to try (6+ / 0-)

      If you can't get the thermostat to turn the furnace on, you can jump the control wires at the furnace to test.  On our oil furnace, if you open the cover, you see a twisted pair of thin wires coming down from the thermostat.  If you touch a wire to both terminals where that wire hits the furnace, you'll make the furnace think the thermostat is turning on.  Then you can see if it lights up and stays running.  If it doesn't, it's probably a thermostat plus the cobwebs like flatford said.  

      The human race has one really effective weapon, and that is laughter. -Mark Twain

      by boatgeek on Sat Dec 22, 2012 at 09:06:00 AM PST

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      •  You sound like a handy man to have around (7+ / 0-)

        Unfortunately, I know so little about furnaces that I don't even understand what "jump the control wires at the furnace to test" means.

        •  Backing up (6+ / 0-)

          The pair of wires from the thermostat will end on a pair of terminal screws.  When the thermostat clicks on, it makes a connection between those wires, the furnace senses it, and starts up.  You can fool the furnace by touching a short piece of wire to both of those screw heads.  That piece of wire is called a jumper wire.  If you have a piece of wire with alligator clips, you can connect it up so you don't have to stand there holding the jumper wire to the two terminals.  

          If that still doesn't make sense, don't worry.  I'm not very good at connecting what I see in my mind to real life when I don't have pictures to explain.  If you google terminal block images, you'll see blocks of terminal screws.  What's on your furnace is probably smaller than most of those images, maybe only two or four screws.  

          The human race has one really effective weapon, and that is laughter. -Mark Twain

          by boatgeek on Sat Dec 22, 2012 at 11:24:41 AM PST

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