Hi all, after many years of working fine, my EuroCombi boiler has stopped working on hot water only. To get hot water I have to turn both the heating and water function on to full and wait for a good half hour for the water to warm up. This means the heating is on all the time. I've had the odd occasion where i've switched the tap on and heard the boiler fire up, but the next time i try it nothing happens. I've checked the water pressure and that's fine so any suggestions/ideas to resolve would be appreciated. cheers,