*Updated* see edit at bottom--- Hi, I have a munchkin boiler 80m from 2004. Ran great when I purchased home last year in harsh Wisconsin winter. No errors. It had not been tuned up in Maybe 3-5 years, so I opened burner door a few months ago to find inside in bad shape with half inch of soot on bottom that ruined much of burner door, ceramic parts, gaskets, etc. so purchased new parts as follows: spark electrode, flame rectification probe, burner door assembly, burner gasket, ceramic target wall, and new condensate pump. Also cleaned inside thoroughly with mild approved solution and flushed condensate with water until it was crystal clear.
Put everything back together and after a week or so of running on and off occasionally during fall it began with F09 error codes. I would reset and it would run fine for a day then another F09. Became more frequent (2-3 times in 24 hour period) for a week or so then just went away and ran just fine with no error codes.
2 months of running error code free then we began getting f10 error codes. Same thing. Runs fine , have to reset 1-3 times every 24 hours. Did this for a week or so and then I went down and adjusted output temp from 165 (with 20 degree range to 145) up 5-10 degrees. Suddenly it ran fine for 3-4 days then began doing f10 just like before. We have to reset it and it works fine for a while kicking on and off and 6-12 hours later it goes F10 again.
I’ve watched the flame when it lights and it looks great and steady. All blue except Every second or two there is a faint flick of orange. Haven’t been able to watch it the moment the code goes off to see what is going on as it is after hours and I would have to be really lucky or put a camera on it.
I am not a heating professional, however I suspect they might have sent me a bad sensor as it was running fine with no errors before I worked on it.
Any help/tips would be greatly appreciated. Thanks!
EDIT: GOT LUCKY - checked it moments before it began malfunctioning and took a video of the behavior. When the thermostat called for heat, it began this cycle of lighting for 10-15 seconds, then would suddenly go out with a click and change in sound of the blower, then re-cycle until F10 error code. I quickly reset it and grabbed my phone and recorded video. Same malfunction was happening until video time (~1:40) when it stayed lit after a handful of failed attempts. *turn sound up
uploaded to google drive (I apologize for long link) > https://drive.google.com/file/d/1KOK7IHI5wZI867CqyoBY_uzhQcerG--m/view?usp=sharing