"Christian McArdle" wrote in
:

So I'm guessing 13 what they call "call for heat" is normally closed
as
in
my day things were drawn in the unenergised condition.

You originally said 1-2 was call for heat...

So I did, see what I mean?

Normally, the CFH is called NO, as it is usually considered "normal"
for the heating to be off. CFH is less ambiguous.

Oh well, I hope Mark's used 1 & 3 without getting electrified, and is nice
and warm

mike