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Potterton Performa 28 - no hotwater but heating works?

It won't ignite fire when hot water tap turned on.
Ragu, May 2008
yep was the diaphragm for ours too. Although the leak of water meant the valve was a bit knackered

Marc, December 2008
Had the same problem and it was the diaphram

Jack, December 2008
will probably be the rubber diaphram that operates the microswitch for hw demand. either be stretched or split. only cost about 5 quid

solent heat services, June 2008
Thank you.

Ragu, May 2008
dhw flow switch is not making

T, May 2008
link Click here to see other fixes for Potterton Performa 28.