I am trying to understand how the thermocouple on my boiler works as I
have bent the copper pipe and need to know whether this is stopping
the thermocouple from working.
As far as I can tell, the end that resides near the flame is just a
pointy outside bit and needs to be heated up for 20 seconds to keep
the pilot light going. There is a long length of thin copper pipe that
bolts into the side of the manifold that is the source point for the
pilot gas supply.
On the end is what seems to be a metal or lead ball which rests on a
plastic plate that slots into place. This plastic plate has a strip of
metal on it. in the thermocouple copper pipe there seems to be an
internal cable that must somehow contact with metal on the plastic
Now, heres the cruncher ... with no power turned onto the boiler where
does the electrical charge that must bridge the copper and plastic
metal strip come from?
I'm baffled ... it seems that this is an electrical switch but there
is no power???
Can anyone enlighten me??