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how do i fix my potterton performa 28?

my water wont heat up and the water symbol doesnt light up, but heating and pressure are fine, and there are no leaks, the pressure has dropped every few days, its 5yrs old
maz, June 2010
dhw diaphragm needs replaced and expansion vessel needs pumped up.

Ian, June 2010
sounds like a sticking diverter valve ,with heating running you should get water?have a look at it

dave m, June 2010
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