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Thanks for the replies. I've been reading up on how the mid position valve works and working out what the loose wires are in the joint box. It seems that one of the loose wires is a blue wire from the cylinder stat, and there is only 1 other wire in the grey wire terminal (2 in total - there...

The programmer shows (on the display) the +1hr added onto the time period and the light on the programmer comes on, it's as if there is a break somewhere else. I think I need to investigate what these spare wires are in the joint box. However, logic would say that if the heating works...

Thanks for that. Just a question, why would a break in the HW circuit affect the CH? And if there was a break in the circuit, wouldn't the HW not work (or nothing would work on the timer at all?)? I appreciate your help, I'm just getting my head round how it works!

Cheers for reply. Yeah I've selected the correct setting, the light on the mitime comes on but the boiler doesn't fire. By way of a check, today I've managed to get the CH boost/advance working...but only if the hot water is switched on at the same time. Shortly after fitting this, I...

Hi, I've just fitted the above 2 channel programmer which was a straight swap i.e. L, N, HW off, CH off, HW on, CH on. It works fine on the timer, both HW and CH come on, and the HW will work on the boost button. However, the CH won't work on the boost button. Any ideas appreciated?