Hi all, Strange query here...! I recently replaced my timer/programmer thanks to the help of folk on here. I now have a Drayton lifestyle 7 day programmer, a Honeywell junction box, and a very old but well serviced and working Potterton Kingfisher MF boiler. Recently (Not just when cold outside) the boiler has been kicking in at night and waking us up as the radiators are at full tilt / heat, this despite it not being set to come on at these times. To try and establish what is wrong I turned the old school thermostat down to zero last night, and the boiler still kicked in, clearly somehow ignoring the thermostat also... Any idea what on earth could be happening? From memory my missus who went down to turn off the power to the boiler doesn't seem to think the programmer was showing as lit up/on. So we have a boiler which is turning itself on and bypassing the programmer and thermostat... wtf? setup below, programmer has been working fine for a few months until these issues have started.