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Thanks I will give that and try hopefully it will sort it!

The pump settings go from one to three, it was set to two and now turned down to one, can I rule out the thermostat on the boiler then?

About a year ago, after a weekend away we came back home to see one our overflows from the loft dripping. Closer inspection revealed that it was the header tank which was being filled with warm water from the expansion pipe when the boiler was running. In the end we replaced the thermostat on...