Armstrong Ultra III 80 Ignition and Running ISSUES

Old 11-25-13, 02:02 PM
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Armstrong Ultra III 80 Ignition and Running ISSUES

Hello all new to the gas furnace's so a serious 1st timer.. but my question i believe is a simple answer just looking for the guidance in the right direction..

unsure as to how old the furnace is mainly im having 2 issues with it..
1) when furnace kicks on i hear the clicking the spark lights the pilot clicking stops pilot flame stays lite for roughly 30-50 seconds then goes out.. no burners light up nothing . will do 2 or 3 times in a 15-20 min period then furnace shuts down and wont kick on again till it thinks its "cold" enough to.. NOTE (other times it kicks on and after 8-10 mins you can hear the sparking again then the burners kick on maybe 1 out of every 3 times the furnace kicks it self on)

Problem #2 is when/once the burners kick on and it emits heat through out my house .. normally the furnace should run until temp reaches desired setting Ex.. 72 deg.
But regardless of how cold it is or when it kicks on it only runs for maybe 8-10 mins before shutting off ??

am i in need of a new furnace or a good cleaning ? if so where do i start and what do i look for ?? any help would be great
(asking here because the quotes i got from local repair companies want to charge me 250$ JUST to come out and look at it!! " non refundable of course regardless if they can fix the issue or not" which is total nonsense ... so im looking to the Web for help ?!?!
again ANY help on where to even begin would be great... !!!
Old 11-25-13, 08:31 PM
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Welcome to the forums.

That is a furnace trade name.... not a model number. You'd find the model number on a plate behind the service access door.

Problem 1 .... as a guess you may have a dirty pilot orifice. How does the pilot look when it's lit ?

Problem 2..... sounds like the burner is being shut down due to high plenum/heat exchanger temperature. This can be caused by dirty filter, blocked return vents, too many supply vents shut off or a dirty A/C coil.

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