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The Heat Exhanger has been cleaned out and appears to be flowing freely on both sides.When you put yourself in the hands of so called Corgi registerd experts you would expect them to know what they are doing. Obviously not as I have found to my great expense. I will just have to bite the bullet...

The burner is igniting and the two 22mm pipes of the heat exchanger appear to be hot but the 15mm hot water outlet goes cold very quickly. As mentioned he has put a new diverter valve on and has also tried swapping the electric solenoid from the old valve, still no joy. Neither valve appears to...

Hi. Boiler stays on S.24 which is Burner ignited (warm start) with the C symbol flashing on and off

Hi Guys new to this site so please bear with me. Having problems with Vaillant 824 combi for over a week now. Central Heating works fine but we are getting no hot water. Had the diverter valve and p.c.b changed at great cost by a so called CORGI fitter, all to no avail. He is at a loss now at...