Ariston microcombi 23/27mffi timer

[limmers]

Good Evening All

Unfortunately my plumbing knowledge is not the best. For the past 4months our timer has not kept to 24hrs (it is 24 hr dial). Although irritating it wasn't too much of a problem. however recently whilst the timer turns the central heating on, it gets stuck at when it should turn off. Today the clock has only moved 5 hours instead of the 14 it should have.
I am guessing the timer is faulty, however I presumed it would either work or not, rather than slow down.
Do I simply need to buy a new timer or is there another problem?

Many thanks

Limmers

 

[bengasman]

can't say for sure form behind the keyboard, but pretty good chance it is just the timer

 

[frankthegasman]

yep the timer is faulty make sure you get the correct one they are not to bad to fit but they do make 2 that look the same 1 is 240 volt and 1 is 3 volt so watch out for that good luck