Hopefully someone can give me some tips on what else to check... My boiler (which heats my hot water and supplies hot water for my baseboard heaters) is overpressuring 3 or more times daily. I have a plumber scheduled for later this week but need some ideas on what to expect. Here's the status so far:
Overflow tank is drained 3x daily with valve from boiler to overflow shut off everytime I drain it.
Water source to boiler (but not for hot water that circulates) is shut off(!) - originally though auto-refresh valve was faulty
Boiler re-pressurizes within 5 hours even with water source shut off.
Question: can anyone give me ideas on what might be wrong? Might my coils have sprung a leak inside the boiler? Any other things that could have gone wrong?
Thanks for any ideas you have!