Honeywell valve motor failure was the issue.
Thank you oil head you were on the right track. Problem now sorted - did a crash course on Saturday. Basically have two mechanical valves- one for heat one for hot water. For those that don't know what these look like go on YouTube and search for...
It's not programmer. Changed it.Some models talk about trip switch if gets too hot but I can't locate this. Bit anxious about getting plumber in coz I know they will just say I need a new boiler but I don't have money and i am sure it's simple solution. Does it gave two pumps? Hence heating...
I have a old Warmflow oil boiler which I mainly use for heating water. last week had oil delivery and hotwater stopped. cant hear pump kick in. however put heating on and it works but hotwater still does not. Any help greatly appreciated