Concord wall boiler. Losing water


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Aug 9, 2013
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Hi all, I keep losing water from my expansion tank and when I go up there I see steam. I have to top it up every 2 weeks by 5" or so but sometimes a lot less. This is dissapointing after only 31 years of nearly perfect operation. I'm not a plumber although I did install this boiler myself back in the day. I guess the problem could be:
a) The Thermocoupling? or
b) The Thermostat? or
c) I have a leak some where under the floor?
Can anyone please give their best guess instead of a new boiler? Appreciate it.
Thanks
Smooth Steve. (someone else is using Steve)
 

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