In an earlier contribution to this discussion,
D Simmonds wrote:


Anyways - i found the cause of the short one of the cables in the
wiring had nicked insulation, AND by coincidence the sleeving on the
earth wire adjacent to it also had a nick - and hence the short
occured - i'm mystified why it ran and then blew rather than just
blowing - however its all solved now.

I suspected it was in the wiring rather than the pump. Glad you've fixed it.

For the wiring i used std Y
plan, however when looking at it again it also had the HW off feed to
the programmer missing!!!!!!!, - and had been that way for years .....


Not good! However, it will still work as long as the HW is on at the
programmer whenever the CH is on, and provided the cylinder stat has
change-over contacts which are wired correctly.
--
Cheers,
Set Square
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