On Sat, 22 Jan 2005 14:05:00 -0800, Bill wrote:

Could sks please advise me on the following:-

The above boiler will not provide constant C.H. It's fine on the H.W.
side but on the C.H. side it will ignite and stay alight for about 25
secs then it turns off for some 30 secs and re-ignites for 25 secs
again in a continuing cycle.
would it be a themostat ? The pump and extractor fan seem to be
performing ok and the pressure is alright.
Any suggestions would be very welcome


Check for lack of circulation in the radiator circuit.
However
Centre stage with a Puma is that Wax pellet actuator on the front of the
diverter valve. Fix any dripping hot taps that may give you a week or two
to get the replacement part.

--
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