I have a vaillant combi boiler (not sure of the model number as the instructions manual shows a few and I don't know where to find it on the boiler). The heating and water are working but the central heating does not fire up for a long length of time before turning itself off again for a while. This causes the radiators to cool down even though i don't think it is particularly warm in the house. I have noticed that the gauge on the flow thermometer (that indicates the temperature of the water in the central heating circuit) never moves and is constantly showing as zero so I wondered if this has got anything to do with with it. Can anyone help?
Thanks
lisa
Thanks
lisa
