The regulator is a 250P-451 Dungs unit and says MAX. In the installation manual for this it tells me the CO and CO2 specs but I see no mention of what my pressure POST regulator should be. I also purchased a namometer to see what my inlet/outlet pressure is and to ensure i've got no significant drop in pressure during firing (Not likely but curious).
I have purchased a gas analyzer to test this and will have it tomorrow. I did look at my exhaust pipe and it's never had a hole drilled to check the CO and CO2 readings. And researching this has led me to a potential AFR issue (apparently these things have a tendency to go lean?). I've also noticed a moaning sound (and a slight vibration from the boiler NOT the fan) as of late only on a cold start (Where it has been sitting a bit). I assume this is due to incomplete combustion and a poor flame. 4 to 3.6 until it fully lights then it's pretty stable 3.9-4.1 uA. Not sure why it was damp to be honest as the condensate isn't clogged and I see no indication of a cracked HX (Perhaps you guys can recommend a way to more thoroughly check for a cracked HX?) I have been monitoring the rectifier current and during those F9 times on initial fire I'm seeing a fluctuation of. I assumed the ignitor was just grounding out on the wet refractor. It was fine and fired great for a whole day (A joke). I noticed it was a bid damp feeling so I took my heat gun to it and removed the moisture and reassembled. So those attempted resolutions didn't help the F09 so I tore it down, removed the burner and cleaned it and also inspected the flame refractor. Rectification probe current wasn't great but more on that in a sec.
It was hard for me to see the spark inside as my sight glass isn't great for some reason. In this last F9 instance I pulled both the igniter and the probe and cleaned them w/ scotchbrite although both looked good and I did get a spark from the ignitor when outside the machine. I annually service this, clean the HX, blow out the condensate and ensure it's clear, clean and test both the ignitor and probe, etc.
I am not a certified HVAC technician but more than competent in the field (They all say that right?) Anyway, I've always serviced this myself and generally when this happens (About once every few years) it's the flame rectification probe needing a cleaning. My first post here and a little disclaimer.
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