My central heating comes on at night intermittanly, approx 10 mins at a time, despite the programmer showing the heating and hot water as off. I don't believe the hot water comes on, but am not sure. The only way I can stop this happening is to switch either the boiler or the programmer off. My question is would you consider this an electrical fault, so I need an engineer or, could it be boiler associated so I need a gas man. I feel it may be the programmer as the boiler will go off if this is swichted off, but I would very much appreciate someone's informed opinion. Many thanks.