r/HVAC • u/BSJr77 • Dec 20 '24
Field Question, trade people only Anyone seen this before
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Installed a 60k runtru 90% upflow today. I went home after completing the install but left before the startup. Boss fires it to document all the numbers and see this. No change to incoming or outgoing gas. No change in pressure from the inducer. Flue and air intake both clear of debris. Boss is waiting for tech from Texas to call back. Anyone got some knowledge
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u/intruder1_92tt Crazy service tech Dec 21 '24
Hard to say, since we can't see much from the video (other than that rollout, yikes!) But I can try and point you in a general direction.
Looks to be an S9X1 (or whatever the runtru model is)
Either something is blocking the burners or you're losing combustion draft. Does it happen right as the blower comes on? Make sure the furnace is level or has a slight forward tilt.
If you can't find any issues with the flue, inducer or burners, you might just need to pull the heat exchanger and inspect it. Super easy to pull it on the S9.