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I am having a problem with my steam boiler that I have never had in the 12 years that I have lived in my house. the boiler keeps flooding for no apparent reason.
I have a single pipe system with wet return.
The system worked fine last season and when I shut it off in late April the boiler had a normal water level.
when I tried to fire up the boiler last week as a test it did not turn on. I called a service technician and they diagnosed that the boiler was flooded with water and therefore didn't fire up. we had to drain the boiler for about 15 minutes to get all the extra water out!! the technician said that he had never seen a boiler add this much water but the tech could not find the source of the water. he checked the water feeder and it wasn't leaking. he had no other idea where the water could have come from.
for the next week I checked the water level of the boiler several times and it was steady and wasn't adding water so I thought this was a one time problem. the last time I had checked the water level was yesterday morning.
this morning however I fired the boiler on and after about one hour of use I saw a lot of muddy water coming out of a radiator very close to the boiler room. I ran down to the boiler room and saw the water level above the maximum on the gauge. I turned off the boiler and started draining water and it took me about 5 minutes of draining to get back to a normal level.
so here the mystery. for the last week when idle the boiler didn't att any water at all and suddenly once fired up it overflowed within an hour. and why did the water rise to a level to start gushing out of a radiator?
any guesses what could be going on? any help is greatly appreciated!