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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a furnace question

Customer Question

I have a furnace question
Submitted: 1 year ago.
Category: HVAC
Customer: replied 1 year ago.
90% Nat gas furnace in attic, new vents, clean no restrictions, inducer motor will pull 4.25 in W.C. suction if I cover up the 2" PVC intake pipe. sequence of operations good but tube coming from combustion chamber only showing .5 in W.C, if jumpers are used on pressure switch, jets will not ignight unless I take the cover off of the sealed combustion chamber, when covered the jets "puff" and try to light then blow themselves out, if I light manually and replace the combustion chamber cover the jets burn OK
Expert:  HVAC Guru replied 1 year ago.

Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond sometimes I get your replies late so there may be a delay in my response.

Is there any condensate blockage, this sounds like you may have a heat exchanger blockage or condensate backup, have you checked that?