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Armstrong air ultra sx 80 natural gas furnace


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Posted

Hello,  I have an Armstrong Ultra Sx 80 natural gas furnace that is acting strange on start up.  Everything in the firing sequence seems to happen when it's supposed to, but it explodes

 

 

when the gas it introduced.  I've tried cleaning the burners and orifices to no avail.  Once it's running it seems to operate normally but that start up sequence has me vexed.  I'm running short on ideas at this point and would greatly appreciate any suggestions.

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