Boiler Flooding Cause

HowardLong · March 6

HI All,

I opened a different thread on this boiler for a different issue, but this is something different I think. If I shouldn't have opened this threat just let me know.

This weekend a LFB-9 boiler flooded with water, I'm not sure how high it was because it clouded the sight glass, but it was enough to shut off the vapor switch. But this system doesn't have an autofeed on it(it's on the list to install one this summer) and we feed water in about once a week when it's get's about to the LWCO and inspect it every other day so I know the water isn't being added unless I'm doing it. I'm hypothesizing that because of bad traps the water is trapped somehow in the radiators and comes down once the boiler has been off long enough to cool down.

Jamie Hall · March 6

Traps can always go bad — but to have enough of them go more or less at once to trap enough water to floor the boiler would also mean that the boiler would go low on water on the low water cutoff would shut the boiler down.

The same logic applies to a serious block in the wet returns.

Whish leads to the simplest hypothesis: the water feed valve leaked by…

Unless there is a domestic hot water coil in the boiler, or indirect tank fed by the boiler. Those have been known to leak.

EBEBRATT-Ed · March 6

Agree with @Jamie Hall

Traps could be contributing but the water feed line is more likely

Boiler Flooding Cause

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