hi .if any one can help ,i have a aration 32 mffi boiler jest seem a little prob, the hot water ok, central heating ok on timer prob is when the boiler cold bar press is 1.5 bar heating cames on bar press go,s up to 2.5 too 2.8 , heighting temp set 45 degs . but some times the boiler lights the the temp gauge go up to 51 very rapped and the boiler shuts down ,then as the temp gets to next calling temp it trys agen maybe 2 or 3 time then lights and runs as normal. is this a easy fix or do i have to wate till it stops if it can be done i can get it fixed as cannot be without heating as got two disabled people in the house. thank you