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Thanks for helping me out, I'll try it out at the weekend. Thanks again.

Thanks for your reply Picasso, but I'm a bit confused by it. you say to connect 1 on the wiring centre to the live on the boiler and 2 to neutral. However the Siemens diagram has 1 as connected to mains neutral and 2 connected to mains mains live. Won't this cause a problem? Thanks Wynn

I've got a Vaillant VC GB 242 EH boiler and a Siemens RWB9 programmer, I've had problems with my system for a while with the diverter valve motor burning out, when I've checked voltages to the valve they seem to be wrong. In order to figure this out I've gone through all the wiring again...

That's right hot water works fine, I've kept the valver in the mid position setting and rely on TRVs to control the central heating, but that's really ineffective and I want o get this sorted.

I believe that it's the motor

Hi again, yes the boiler doesn't fire up. to be honest I've been living with this problem for years and can't remember what else I did to confirm that the actuator failed. However i do remember that first time it happened I bought a new actuator and everything was fine for a month or so. So I'm...

Hi thanks for replying, I have a Siemens RWB9 programmer, RAA02 room thermostat, Ram1 tank stat and Vailant VC GB 182 EH boiler.

Hi hope someone can help? I've got a problem with my 3 way valve, I've changed it twice and both times the actuator has failed after a few months. I assume that there is a problem with the voltages going to it. I've measured the voltages and copied them below, any advice would be welcome...