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Posted by HeatPro on April 03, 2008 at 11:41:55:
In Reply to: Re: How would I purge air from hydroair system in attic? posted by Dave on April 03, 2008 at 11:37:23:
: By the lower tube for pressure sensor, you must mean the tube that goes from the air proving switch down into the burner chamber and clips onto one of the burner tubes (to measure air pressure in burner chamber)?
++Yes.
As you don't get to see a flame at all, it is probably before an ignitor problem with the pressure or fan switches ceasing the flame trial.