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I have a Miller 90+ furnace running on Propane gas. We I start the furnace, everything is working perfectly except I notice that the first burner out of the 4 burners does not light. I have checked the orifice for blockage and even switched the orifice with another and it is still the burner off the first tap on the header. All four burners are in the same combusiton chamber and downstream of the main gas valve. My concern is that gas is still coming out of this orifice and eventually it may light or build up enough gas to POOF! What can be causing this burner not to light.

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Hi, propane gas is really hard on a furnace in causing a burner or burners to carbon up. Yes, there is gas coming from this orifice, what you need to do is grasp the burner from the front, lift the rear out of the slot it sets in as you pull forward, and take the burner out. Turn it over and clean it out. It may be full off rust and some carbon. You can do this, as it may take care of the problem. We have taken on some furnaces, if your home is heating fine on the 3 burners, and remove the orifice and just plug it off. Doesn't hurt anything at all, I believe its a 1/8 or 1/4' pipe plug. I have done this many times when the temperature rise is to high on a new unit, and the only option is to shut down one burner. No harm or adjustments needed. Try cleaning the burner first and make sure the tail end sets back in its slot. If this works, great, if not, plug it off and your set. Will save on your gas bill also.
Sincerely,
Shastalaker7
A/C, Heating Contractor

Posted on Nov 08, 2010

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