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Thank you for your replies and now that it has been explained the fault does lie with me. My experiences of central heating timers is that they have an on and off settings. I will programme the thermostat with a lower temperature for overnight - the last one been 10.30 will set it to 16...

yeh that's that the problem the central heating is coming on when its programmed not to! - set to come on 6-8.30 , 4-10.30 but is on in the middle of the day and in the middle of the night Have checked by altering clock to a time period that is outside of programmed ones and altered...

i've only recently put the jumper in to see if it made a difference! - but it didn't thanks for the reply i cant see a 1 and 3 in the boiler its just the block but like i said boiler is switching on and off and firing up and providing heat (much to the pleasure of the wife!)

i recently bought the honeywell cm927 controller on the recommendation of a couple of friends. Since i installed it it has never run to the programmed times? All it seems to do is work as a room thermostat and switches the heating on and off according to temp setting. As far as i can see from...