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Hi there, shorted out the room stat wire and no change, also got 230v there. When i go across the switched live at the boiler i get 170v, as GG said it should be around 230v can i assume that in all probability its the diverter valve not supplying the correct voltage ?

Thanks for the reply ChrisR, should i be able to test this before buying a new valve Can i isolate the valve to test the rest of the CH system, if so how ? The diverter is a acl drayton mid position valve 679h340-30L0, do you happen to know if i can just replace the motor assembly rather than...

Thank for the reply Gasguru, by motorised valve do you mean the one by the tank that diverts water between the CH and the HW ?

Hi there wonder if anyone can help me, i have a Best 50 boiler that is giving me problems. The hotwater side of it works perfectly well but the central heating has stopped working. Symptoms are that when we turn the heating on (via the room stat) the boiler fires and a loud buzzing noise...