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Hi I think I must have got diverter valve and servo valve mixed up. When I turn on the hot water tap a pin rises on top of what I presume now is a pressure sensing unit. This pin pushes agains a plastic lever which has a spring return. This lever than pushes against the DHW switch and also...

Hi I have a Vaillant VCW GB 221H combi boiler. I've had a problem with the boiler sticking in DHW mode for a few weeks . When I turn on the hot water tap the pin on top of the diverter valve rises and the boiler fires up OK. When I turn off the hot water tap about 50% of the time the pin on...

Hi I have a Vaillant combi boiler. The wiring diagram is for the VCW GB 221, 240,280H. I presume this is 3 different models. Can anyone tell me what the difference is between the 3 models and if there is any way of identifying my boiler as there doesn't seem to be a model number anywhere on it...

Hi I have a Vaillant combi boiler which has just started showing a fault. I'm not sure what the exact model number is but the details on the wiring plan are VCW GB 221, 240, 280 H. The symptoms of the fault are:- 1. The boiler won't fire up when the central heating is switched on 2. The...