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Old 10-19-2008, 09:40 PM   #1
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furanace won't kick on automatically


my 22 year old heil furnace will run fine if i manually press the up button on the programable thermostat, but it won't kick on it's own. i replaced the thermostat and it is doing the exact same thing. that makes no sense to me!

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Old 10-19-2008, 11:28 PM   #2
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furanace won't kick on automatically


what brand and model on that new stat

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Old 10-19-2008, 11:40 PM   #3
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furanace won't kick on automatically


Check for a loose wire at the W or R teminal on the furnace.

Baring that you have a bad stat AGAIN, or some issues with the furnace,

Is it a standing pilot or an electric ignition.
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Old 10-20-2008, 07:56 PM   #4
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furanace won't kick on automatically


it is an electronic spark ignition
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Old 10-20-2008, 08:04 PM   #5
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furanace won't kick on automatically


the furnace is a HEIL NUGJ100AF02 it was a honeywell stat but i already took it back so i dont know the model number. the furnace is running great as long as i manually hit the up on the stat? any ideas.
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Old 10-20-2008, 08:34 PM   #6
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furanace won't kick on automatically


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Originally Posted by 36inchflange View Post
the furnace is a HEIL NUGJ100AF02 it was a honeywell stat but i already took it back so i dont know the model number. the furnace is running great as long as i manually hit the up on the stat? any ideas.
I don't follow what you mean by up on the stat.

Do you mean you increase the temp?
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Old 10-20-2008, 09:44 PM   #7
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furanace won't kick on automatically


the furnace should kick on when the temperature falls 2 degrees below the set temperature, but it can drop 10 degrees below set temperature and it will not kick on until i hit the up teperature on the stat. then it runs perfect and shuts off just like it should. could it be a bad gas valve?
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Old 10-20-2008, 11:15 PM   #8
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furanace won't kick on automatically


I'd say there are too many varibles to nail it down with out doing some tests.

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