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K. Cast iron boilers always run high co until the system heats up. Also that Honeywell intermittent pilot gas valve is prone to opening main valve on call for pilot. Most times they light np. Other times.....boom
Steve, not sure if it helps but I have the exact same boiler in my house that would turn on and off all day long. After doing some research online, I found out the boiler temperature was set to 140 so as soon it reached 140, it would shut it off and then start again after 10-15 minutes. I raised the temp to about 200 and now more more On and off issue. Just my 2 cents since you help so many of us learning from your videos.
I am watching this because HVAC guys are stretched thin here Nov 2021 and gas company hasn't called back about an appointment to have someone clean the flame sensor. I took classes in oil burner in 1990. This can't be much worse.
I have the same issue right now with Is a Weil McLean CGA 4 I replace the flame sensor unit And it kicks on runs for a few then shuts off kicks on runs for a few and shuts off it does not stay running long enough to generate any heat. I don't know what to look for next any suggestions what to check. Sometimes it goes through the start of process but never actually fires up sometimes it fires up runs for a few stops and then tries to kick on again. I'm just mechanically inclined homeowner Not an HVAC specialist.