Can someone help. I have a valliant combination boiler, my CH works fine, however when I turn on the HW tap, the boiler fires up but I get no HW. Help please.
It sounds like the diverter is failed or seized up.
A boiler engineer would be better than a plumber!
Make sure he understands the boiler! Ask him to show you the diverter valve! Its the silver lump at the rear lower left with a metal cover and some wires coming out towards the front.
We would charge £136 inclusive for repairing it in London or Edgebaston. It does need about 200 mm clear access space to the left and under the boiler.
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