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thanks Agile. I will try and buy a new diverter valve and see if the problem is fixed.

thanks for your reply namsag. I think it is a normal performa boiler. The micro switch(s) both work ok as i can see a pin from the valve make the microswitch. The microswitch nearest to the front makes when HW tap is opened and the microswitch furthest away from the front makes when central...

Hi i have a potterton performa 28 boiler which heats the radiators when ever the hot water is used??? Any idea why and what i can look for to resolve this issue. By the way last year the boiler repair man chaned the heat exchanger, but the problem remained.