Hi Joe
We had the same problem with our Teka and we were told that it is cheaper to buy a new one, as it is probably the control card and these are very expensive and there is no guarantee of the problem not recurring.
We were also told that if you get three yrs out of a fridge freezer in Spain you have done well!
We ended up buying new one from Mediamart in Cartegena and now leave it on when we are not there. We just turn it off when we are not there over the winter as we were also told they don't like being turned off and on regularly.
We also took the 5 yr warranty with Mediamart awhich was €47
Hope this helps
Brgds
Ken