Recent content by Toppers

What do you think the problem is though as no one seems to know?

I have a conventional Saunier Duval boiler that is approx 14yrs old, it is set on a daily program to come on in a morning and an evening, the morning setting is fine (its only on for around 40mins), the evening setting is timed to come on at 5pm - 9pm but by around 6.20 the radiators are going...