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My Vaillant combi does not give any hot water, I have changed the diverter valve and it seems stuck in the CH position ie both microswitches made, it only changes over when open the PRV and drain off.
I have removed and cleaned all the capilliaries, is the next step to change the servo valve - which is operating when hot water is drawn but is not making the diverter valve change over
I have removed and cleaned all the capilliaries, is the next step to change the servo valve - which is operating when hot water is drawn but is not making the diverter valve change over