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Potterton Puma?

I have a potterton puma boiler and it has recently started only heating the water when the heating is on and it only heats it for a short period of time what do i need to do to get this sorted?
Amy, September 2009
Repalce the hot water diaphragm

www.elanar.co.uk, September 2009
link Click here to see other fixes for Potterton.