Thanks Dave for your help. - No luck so far. It's been near 2 weeks since looking at it and now the temperature read out is displaying 32 deg C (not the 18 deg C anymore) , the hot button is still not working, and the cold button has also stopped functioning ( which could be a correction of its previous out of character way)
. I think the next step could be an expensive trial and error part replacement process. - Any other suggestions?
Cheers Dazz