furnace on the fritz

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power1966wagon

Jan 26, 2007, 02:39 PM

Afternoon....first timer...was hoping someone has some furnace repair knowledge....Unit is a Carrier Updraft....Burner lights until its time for the blower to come on ...sometimes it goes out exactually when blowers starts...other times it will stay lit 10/30 sec. after start of blower.....blower runs normal run-time, but of course its blowing cold air...I changed thermostat...nothing changed....any ideas?....any help would be greatly appreciated
Thanks again
power1966wagon

NorthernHeat

Jan 27, 2007, 09:58 AM

Age and efficiency of furnace?

power1966wagon

Jan 27, 2007, 06:03 PM

Thanks for the response....1981 ...80%
Thanks

NorthernHeat

Jan 28, 2007, 08:19 AM

Does the furnace have a pilot light. Carrier uses what is known as an auto pilot which has 3 wires, white, green and yellow that come out of the pilot assembly. It doesn't sound like the burner is running long enough to trip the main limit so I would suspect the auto pilot is dropping out voltage to the main gas valve.