DIYbanter - View Single Post - Why the Fire in a Gas Boiler Extinguished By Itself?

wrote:
I'd have it looked at by some local boiler or hvac slack jaw. There are
plenty of reasons the boiler could have shut down....dont know exactly
how your boiler is set up but most gas equipment is equipped with
several "safeties" which will shut the thing completely down in the
event things are not running right.

Could be a thermocouple gone bad but it could also be other
things....we just dont have enough info on your particular piece of
equipment to know.

~:

Yes, the boiler has a thermocouple, and it goes bad every year for some
unknown reason. I am trying to extend its life by shutting off the
pilot light when we are not in heating season; but I don't usually
remember doing this.

Seem like the thermocouple is what shut off the gas supply when the
flame is out. This explains the reason why I didn't smell any gas even
when I saw that the control switch was at the "ON" position.

Jay Chan