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this boiler has an intermittent problem where by it reguarly locks out when called for HW (without firing), this problem also extends to CH but not always as it often fires no problem and rads getting red hot. The pin is connecting with flow switch and fan/pump etc appear to be working fine...

I been attempting to fix one of the above boilers, there is central heating but the boiler does not fire when a call for hot water is made. I noticed that the servo valve/switch was not connecting and was advised by vaillant that i should replace this part, after doing so there is no...

Hello everyone, Just replaced a corroded diverter valve and everything works fine apart from hot water is cutting out and starting up repeatedly while running. Ive felt the pipes going into the heat ex and they are getting red hot so imagine this is possibly somthing to do with it over...