The programmer has two settings, one for Mon-Fri and another for Fri-Sat. It switches on and off as it should during the week but doesnt come on at the weekend at all. Then on Monday morning it works fine! Any ideas???
If you need help to do this, you need to tell us what programmer it is... As there is about 30 different programmers in common use in the UK with this appliance at the moment.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.