On Sun, 26 Nov 2006 10:17:45 +0000, Dave Plowman (News) wrote:

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. ;-)


They were (are?) specialists in rebadging and used reasonable kit from
major manufactuers including Aqualisa shower mixers.
My wild guess is that this might be a rebadged Ideal Elite such a boiler
could well have an overrun implemented as a simple temperture sensitive
changeover switch. It has become stuck in the hot over-run position.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards