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Thank you all for your considered responses. I have just had an engineer out and naturally the boiler was operating without a problem! However I explained the symptoms to him and it is his belief that the issue is with the diverter valve. I am not totally convinced but will keep an eye on it...

I have a Worcester Greenstar Heatslave External Boiler model 18/25 and the heating is being temperamental. It doesn’t always come in. As hot water has precedence, what I have done previously is run the hot water until the boiler fires up and then when the HW was at temperature the diverter...

John, Thank you for your prompt response. Particularly on Christmas Day! I will do as you suggest. I was aware the hot water takes priority but I am still puzzled. When I have had this problem previously I have run the hot water tap to fire up the water and when the water is up to temperature...

I have a Worcester Greenstar Heatslave External Boiler model 18/25 and the heating is being temperamental. I suspect the problem is the diverter valve but I am not sure. When I have had problems before, I run the hot water until the boiler kicks in and normally the heating will come on. But...