BAXI combi doesn't switch off

[RobGuy75]

AAAAAAAAARRRGHHHHHHHHHH.

With all the bills mounting up this is the last thing i need.
So please help guys

Ive got a baxi combi instant 105HE boiler with Drayton Lifestyle LF711 Timer and a Drayton dial thermostat ( Relay Type ).
The problem being is that it wont switch off. The timer will switch the led off and on but there will sometimes ( but most of the time ) the rads will be still warm to hot , as it varies.
Last night i Switched the timer off and not on timer and turn the thermostat down to its lowest setting which is 10 C , got up this morning and the bleeding heating was on

So guys any ideas , the timer and thermostat are both quite old so was thinking the timer /control panel must be up the left.

Cheers

 

[griggs]

Is your hot water working OK?

 

[RobGuy75]

Yes . it works fine.

 

[RobGuy75]

Boiler was serviced in the summer and every one before that

 

[namsag]

Bottom lefthand corner of boiler behind control panel . brass circular thing facing you with a pin in the middle when HW demanded this pin comes out and hits the micro switch when tap off it should retract your pin is either sticking out or microswitch is faulty making the boiler think there is a HW demand

 

[RobGuy75]

I'll check that out ,thanks .
But HW is fine but the HW for rads is in its own loop system so recycles the water , Would that micro switch and pin effect that system?

 

[namsag]

I know your hot water is ok but the boiler thinks a tap is on

 

[RobGuy75]

Got you . i`ll check that first. Anything else it could be i should check ?