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Was down in the basement cleaning a paint brush yesterday and noticed that my boiler cut out on low water during a cycle. I've never seen it do that before, but it doesn't mean that it hasn't happened. It tripped and was out for ~30 seconds while I presume water returned to the boiler. For various reasons I have watched it run through full cycles before without issue.
Burnham V8-5 (natural gas, circa 1991)
MM Probe type LWCO (new in November 2013)
It wasn't particularly cold when this happened (25 deg F maybe)
The boiler had been running for ~15 mins when it shut off.
Pressuretrol set for 2.25# cut out, 1# differential (per my 0-10psi gauge).
No previous issues with surge / bounce - just happy movement of ~.5" in the glass.
2" dia riser out of the boiler. Main as a header (a problem I'm aware of but haven't acted to change this since we bought the house 3 years ago).
No main vents (need to tackle this issue this summer - I've been distracted with other issues in the house)
Any ideas for cause? When I've heard of this happening before, it's been suggested to check for dirty water, clogged wet returns, overpressure, etc. I kind of doubt it's clogged wet returns and I know I hope that's not the case. Is there an easy way to check that though?