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I finally had the chance to clean out the orrifices on my furnace. I didn't find anything in them but I haven't had any burning in the tubes since I cleaned them.

Now all I have to do is...

Had a funeral to attend. Have left the cover off the furnace for two days and haven't heard any burning in the tubes. Got to believe it's related to air flow.

I'm afraid your Parker wouldn't fit well in the strip mines I usually fish. Maybe in the Illinois River? I'm more of a bass fisherman. Good luck.

Thanks Grady. I know how to fish; although, the last couple of years I'm not sure I know how to catch fish.

OK, Thanks. I'll give it a try and report back.

I should have mentioned; I did have the furnace serviced. Burners were cleaned and gas pressure at the burner header was checked to be in spec. Service man did not clean orifices so I can try that.

Occasionally, when my furnace lights off the flame burns inside one of the burners instead of on top like the others. Is there a fix for this? I have tried to adjust the venturi but it doesn't...

I'll try the cool spray. I mistyped the model number. It is a NULK125DK03 made by Heil. I'm going to order a flame sensor and try it. From other posts it seems like the most likely to be...

I'll give it a try but the only thing that sees cold would be the gas line since the intake air comes from the basement. I guess that could cool the gas valve to the point of something sticking in...

HVAC1000
Unfortunately I do not have a two PVC system. Intake air is from the room. My next step is the "shotgun" approach. I'll put a new temp sensor first, and then the electronic ignition...

I have a Heil Model MULK125DK03 furnace. It works fine for AC and for heat as long as the outdoor temp is above 20 degrees. When it gets cold, especially when the temp is dropping the furnace...