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I used to hold the reset button down for 5 seconds to start it up if this happened & it usually worked ok. The problem came back last year and had to get the circuit board replaced. It started playing up again recently and only had CH when the water was heating up......problem was a broken...

Thanks...probably is 4037A, the first part is scratched over. What is it that this box does, or doesn't do in my case? Are they easy to change for a novice & are they expensive to buy?

I've got a problem with my central heating .... it will only stay on while the hot water is heating up. If the tank water is hot the heating won't come on at all but if the hot water is being used I'll get heat. The CH won't work independently. System is a Potterton Suprima Boiler with...