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What would cause the boiler to start work even though the programmer was set to off?

I am getting an error CON on the display of my Vaillant Ecotec Plus 428. I have swtiched then off switched on but the error does not clear. I have looked at the manual and the error is "no communication to main board" and the cause is "connection error display main board". The boiler was...

I have recently drained, flushed (using mains) and refilled by sealed heating system. However, the boiler keeps cutting out due to there being insufficient return water to the boiler. The boiler starts, the flow gets red hot, the boiler cuts out. This then repeats every few minutes. I have felt...

I have a Grundfos type UPS 25-50 130 p/n 59425401 on my underfloor heating manifold. Recently I have been having problems with my underfloor heating. The pump sounded as though it was worked but seemed to be getting very hot. I opened the screw on the front to check for air and make sure it...

I have a scantronic 9751 alarm system. How do I reduce the sound made by the keypad when pressing buttons and also when setting/unseting the alarm?

My underfloor heating manifold is the "pump mixing modular manifold" as per the link below: http://www.warmafloor.co.uk/pdfs/std-pmp-manifolds.pdf The problem being that, when the pump is on, the hot water gets as far as the injector valve but doesnt continue around the manifold and hence...