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Thermostat wont turn on heater Robert Shaw 9600 prog.

I had this trouble 2 years ago. . . . Air, blower work fine, when I turn on "Heat" it clicks a couple of quick times and wont start up the furnace. The system is only 5 years old .( i believe it was installed in july of 2004 , furnace, a/c lennox)
I've replace batteries and "reset" several time thinking the batteries were too low to start it up.
The thermostat was replace 2 years ago and now its doing it again. Any suggestions other than having to get them back out here would be helpful. Thank you .

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  • Anonymous Dec 20, 2008

    I had issues determining what color the "common" wire was. I have a red, white, yellow and green. Between the white and red i get .10-.70 volts - between the yellow or green and red I get 28 volts.

    So does this mean I need better batteries - the instructions say "energizer" - but if this is the case - does it mean it is not my furnace?

    I can hear the unit buzzing atop the roof. But inside to air blows unless I turn the "fan" position to "on". - Then of course no heat comes out.

  • tomtom09 Jan 06, 2009

    Hi
    Please I don't speak English too much, but I have a problem with my heater at home, the unit is at the top of roof.
    My heater was working good in automatic position, in this moment from 2 days isn't working. If I connect aircondition work good, if I connect fan is working good too, but when I change to heater then don't work.
    Right now my home have 32 degrees.
    I don't know anything in this problem, maybe is the thermostate, some friends they say the problem is in the light to fire the gas at the roof.
    Ones again escuseme my English, but I can read more, I'm in Las Vegas Nevada.
    Thanks everybody.
    Tom

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I have a thermostat 9600 Robertshaw and I have to use the trip switch to start my furnace. Then it reaches the temperature and sometimes it will kick in by itself but majority of the time I have to trip it. I have changed the batteries cleaned the thermostat,and reset it. Is it time for a new thermostat and can I replace it myself. Thanks

Posted on Jan 16, 2009

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Look under the cover where you change the batteries. find the common and the white wire. if you have it in heat and there is 24 volts batween w and common, then the stat is good and the problem lies in the furnace. checking in the furnace the power should arrive at the furnace control board or the common and white as 24 volts also. first to start is the forced draft motor, 120 volts. next the glow bar , 120 volts or ignitor arcs and then gas burner lights and heats up then the blower runs . whatever item fails to perform is your problem . check with meter where possible and if power goes in and item doesn't perform thats your problem. when the forced draft motor runs it closes a pressure switch usually to the upper right and then the board knows it can proceed to power glow bar or ignitor and light burner then open the gas valve for ignition. good luck

Posted on Nov 07, 2008

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