central heating problems

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please can anyone help? I have a drayton lifestyle lp722 programmer/timer and a drayton mid position actuator.
I have put heating on timer to come on at 6.30am and to go off at 7.30am and again to come on at 5.00pm and to go off at 7.00pm.
the heating is coming on when asked (timed) but it is not switching off when timed to go off. the boiler will stay on but does eventually goes off on it own at 12.oopm I have checked the mid position actuator and the lever W M H does move when asked to the correct position when asked for hot water(W) both water and heat(M) AND HEAT ONLY (H) does anyone know the problem and what it is?

 

[Tibbot]

It's a 7 day programmer, have you checked your dates are set correctly?

 

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yes I have reset all the times just in case there were wrong and checked the days etc

 

[D_Hailsham]

The LP722 is a two-channel programmer. Do you have the same problem with the hot water channel or is it only the heating channel which is playing up?

 

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my apologises its the hot water that does not switched off when the timer tells it to.

 

[picasso]

Have you just moved in to the property and found this problem or has it just started happening ?

 

[doitall]

Why have we got two threads going on the subject.

 

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I don't know - I'm trying to reply to both!

 

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No this problem started in February and I have been turning the system off at the fuse box which is next to the programmer/timer