heating problem.

[brucemoore]

I have Comfortmaker gaspack installed 1990.
When the heat is trying to come on, I can see it in the thermostat (blinking temperature). However the heat and blower are not on.
To get working I move the heat/off/air switch to off then back to heat. The thermostat is a setback type and I have changed the batteries.

Ant ideas what needs to be done?

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www.moore-biz.com
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[Hube]

Welcome to the forum. First, how do you know the "heat is trying to come on"? A "blinking thermostat can indicate that a signal has been sent to the gas valve and could energize it to open in a few seconds. When you see this "blink", how long after does it take for the burner to lite, or does it without you flipping the switch? Hube

[brucemoore]

The blinking occurs indicating that the gas pack is going to ingnite the pilot, start the blower and clear the ducts, then light the burners. I can hear the unit but the blower does not start. All I have to do to get everything to work is move the heat/off/air switch to off then back to heat. What happens different when I switch the heat/off/air switch to off then back to heat?

quote:Originally posted by Hube

Welcome to the forum. First, how do you know the "heat is trying to come on"? A "blinking thermostat can indicate that a signal has been sent to the gas valve and could energize it to open in a few seconds. When you see this "blink", how long after does it take for the burner to lite, or does it without you flipping the switch? Hube

visit my website:
www.moore-biz.com
password: time&money

[Hube]

Make sure the terminals on the T- stat and the furnace gas valve (relay) are clean and tight. Hube