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I have a Munchkin boiler problem. It is running on Propane, Glycol solution, and 4 Zones. It has a differential-pressure bypass line between the supply and return lines leading to the 4 zones.
The problem is every now and then it seems like the gas valve on low fire will set up a harmonic that vibrates through the mechanical room and up into the cabin. It can go days with out doing it and then it will do it off and on for an hour or two.
The last time I checked my CO was 80 and my CO2 at 9.5
I have come across this before with a natural gas system and never could resolve it, I ended up replacing the boiler due to inttermitant lock outs that could not be eliminated no matter how many times the CO and CO2 were dialed in.
This drove me and my customer crazy, not to mention the wasted hours and money.