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Hi @terryplumb, Apologies, no the radiators don't heat up when only domestic water is selected. There is a switch next to the pump that directs which is operational (both located adjacent to the boiler). Sorry, I'm not a plumber so don't know the technical terms. 1. I can have hot water only...

Hi @danfre, Photos attached, let me know if they show all that you need and if not I'll take some more...

Hi @terryplumb, Thanks for your reply... The programmer is the Honeywell ST9420C (picture attached). It is set for domestic hot water only for 20 minutes (no central heating)... It's been set this way for the last ten years and up until recently has worked without issue providing piping hot...

I'm having ongoing issues with my boiler heating water... I have an Open Vented system with the Cold Water Tank and F&E Tank in the loft, the Hot Water cylinder in the Airing Cupboard and a floor standing Potterton Promax FSB 30 HE Boiler in the Kitchen. The boiler is set to come on for...