Hi all, I'm hoping for any advice regarding my currently non-working Heatline Compact S24 boiler, I am aware from reading on here that it's just about the cheapest there is but it was in the house when I bought it so I'm pretty much stuck with it for now! Two days ago it stopped working (both hot water and heating) and is now constantly showing the "Fault On Air Pressure Switch" warning light which it has done before in the past but magically it started working again shortly after so I thought nothing more of it, looking back now this was possibly stupid of me not looking into it further at the time! After switching it off or resetting it is starts to make all the right noises but then never fires up and then that warning light comes on. Anyway, I've been advised by a friend of a friend (I know, ultra reliable eh?) that I need to replace the air pressure switch however I have taken a look and I'm not convinced that this is the problem as I've maybe foolishly tested it and as far as I can see it's working. I've only tested this by putting a meter across it's terminals and gently blowing/sucking it and the switch appears to be working fine, also I'm getting exactly the same warning on the boiler if I bypass the switch altogether and have the wires connected or disconnected. That's about as far as I'm prepared or able to go when it comes to heating/boilers and hopefully I've not done anything too wrong and I'd like some advice from someone that knows what they are talking about before I go any further or shell out the £40 on a new air pressure switch for no reason at all. Cheers in advance!