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Need help diagnosing auto-filler problem please
My 7 year old Burnham steam boiler is working flawlessly except for a brand new intermittent glitch that just started a week ago. The automatic filler usually runs very rarely, and when it does it usually runs for 3 seconds or so. Last week it ran for about 2 seconds and then shut off. 10 minutes later it ran for another second or so and shut off. 12 minutes later it happened again. I turned off the valve to the auto-filler. With the auto filler valve closed, I no longer hear water flowing into the boiler.
The sight glass is about 2/3 full, a little higher than normal. There is no legitimate need for more water.
At the moment I am okay leaving things alone and checking the water level manually, but I am (wicked old and) concerned that if I get real sick and can’t manage this process then it will be difficult for my wife. I would prefer not to bring an additional person into the house, times being what they are.
Can you suggest how I might diagnose the problem? Is it the low water cut-off mistakenly calling for water? Is it the solenoid that opens the fill valve operating with a mind of its own? Is it some problem that I haven’t even thought of?