Hi - I wonder if anyone would be able to advise?
My mum has an 8yr old Glowworm Space Saver 40B MKII boiler with Honeywell Control GC NO 41 315 88 - and this has 3 settings as per norm - 1 for Heating 1 for Hot Water and 1 for both.
Even when she has just the Heating on and the Hot Water off...