Thank you Muggles and ianmcd, I really appreciate your thoughts and advice.
I have one of these in my airing cupboard (picture attached, hopefully) which was checked and working fine when the guys were here? Is that what you meant?
Hi Muggles, thanks for your reply.
I have a Honeywell C21 programmer, I'm not sure about Zone Valves as I'm not sure where they are. Are they in the boiler unit itself?
Okay, I'll attempt to make this as brief as possible. I have an Ideal Classic boiler, an airing cupboard and a water tank in the loft.
My boiler now has a 3 weeks history of 'playing up'. Some days she will not fire up at all, other days she runs smoothly for hours. At times she does a constant...