Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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Furance will not stay running

The furnace will kick on, after about 10 seconds kick off. The t-stat is brand new and we thought it was the old one so we changed that. Everything on the t-stat is hooked up perfectly and the furnace is making an odd sparky sound. Never done that even when it wasn't working. The fuse is good and the igniter is new...any suggestions.

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Sound like the flame sensor is dirty,bad,or out of place.

Also,check and make sure the gas valve is working,You will need to watch the burner as it calls for heat,If you get a flame then the valve is working,No flame means either gas valve is bad,shut off or not being sent signal to open.

Posted on Jan 28, 2009

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Hi,

Check your manual for your t-stat to be sure that it is set to your type of heating system, this is usually the cause. In the manual for the t-stat, it has settings for your type of system. You state furnace, that means it blows warm air, a boiler circulates hot water. This is most likely the cause of your heating system not operating.

I am assuming that this is a gas system. It sounds as if you are getting ignition, which is good, but not any fuel. I ask that if you are not familiar with gas systems to call a professional, but you can hear if the gas valve opens by starting it up and if you hear a series of clicks and the sound of air coming through, then the valve is opening. It can be a number of things and you will need a multimeter to check the operation of all the connections and relays.

Hope this helps.
Paul

Posted on Jan 28, 2009

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