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You guys are so bloody good! Kevplumb your were spot on, I now have a working system thanks to you and everyone else here who helped me fix this problem. Went out today and bought a £5 foot pump from Argos, pumped the expansion vessel up to 1bar (with the system drained down) refilled to...

Thanks for the advice I will try the flush as soon as I can get the x400. I can see the temp gauge thing was a red herring now as I traced the cable and it appears the gauge is a standalone thermometer and is not connected to the pcb in any way so I guess it is just faulty but not part of the...

I have an old Vaillant Sine18 T3 which was working fine until last week when for no apparent reason the boiler failed, no hot water or central heating but the pilot was on. Having trawled through these forums I discovered that the overheat reset had tripped (thanks to weargas reply to Beavis...