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Nigel Hewer

raden Wrote:
In message , "Dave Plowman (News)"
writes-
In article ,
Nigel Hewer
wrote:-
I have an old Servowarm Elite 50 Central heating boiler and the pump
failed. I have replaced the pump but the Pump does not shut down when
the boiler turns off.-

Do you mean when the boiler is switched off by the programmer? Older
systems will often have the pump running while the boiler cycles. On
those
the two aren't really interdependent - the pump is controlled by the
room
stat while the boiler by its own.
-
Does anyone know, if I purchase a new programmer, if this has the
pump
overrun facility on it or do I have to find the fault, "solenoid or
relay?" in the original Timer/programmer.-

Pump overrun devices are usually part of the boiler rather than
programmer.

Of course Servowarm tended to have a mind of their own. ;-)
-
I'm just wondering if his timer is a Horstman 424 - one version of
which
(the emerald?) had a bimetalic pump overrun integrated into it

OP - you are just going to have to dig in a bit deeper and have a look

--
geoff

Thanks for everyones comments.

My system does not have a room stat and on closer inspection of the
timeclock have noticed a bi-metallic strip that is broken (thanks
geoff) Could I replace this or replace the timeclock? Any ideas where I
might get one?

Regards
Nigel

--
Nigel Hewer