I have a 5 yr old Ideal Icos HE12 with a Range HE water tank with 13 radiators on three floors throughout the house. The issue is we either have hot water or heating (not both at the same time). We are currently experiencing no hot water. The boiler appears to be working as the display shows 'c' with a flashing /static LED, making the usual noises. The water tank has pipes at the bottom & middle (CH) which are very hot to touch and the top pipe (HW) is cold. One of the pipes from the top of the boiler is very hot and the side of the boiler is hot to the touch as well. Can anyone explain the reasons for this and what the remedial action would be?
Thanks for your help