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My totaline thermostat model #p474-0100-a the backlight is staying on and when the furance is running after only a couple of minutes it shuts off and my furance shuts down .

I just had the motor replaced in the furance .When i light the pilot light and turn the furnace on , long before it reachs the temperture its set on the furance just shuts down pilot light also , the backlight on the thermostat is staying on and a black haze is covering the green

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Multiple issues that are not related. If the pilot light goes out then the thermocouple might be bad. If the pilot ignites the gas and everything shuts off, it sounds like the over temperature sensors are detecting heat in excess of what is allowed in the firebox. The thermostat issue has nothing to do with this.

Posted on Nov 19, 2014

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