Thanks Dr, never thought about a circulation fan, with it switched off everything is fine and it uses less eleccy so that is the way it will stay.
To give an idea how much MORE the eco mode is costing.
Last night, 11 hours, fridge opened once in un-heated kitchen - cost 5p in eco mode
Today, 11 hours, fridge opened about 8 times, freezer opened 3 times in un-heated kitchen 3p not in eco-mode.
Even though the kitchen has been warmer during the day and the fridge and freezer has been opened a lot of times more, it is 40% cheaper when eco mode switched off.
Or conversely it costed 60% more in eco-mode.
Don't know why it iced up, everything is fine, with eco-off the compressor is on for shorter intervals and more frequently. With eco-on the compressor was on for much longer periods but only a few times a day.
As an aside, many of these single-compressor fridge freezers are not rated for less than 12 degrees (C) temperatures. The fridge doesn't "warm" up to operate the compressor to keep the freezer frozen. A neat solution is to bodge the internal fridge light on during cold weather, this means the fridge has to operate more which in turn keeps the freezer frozen.
I used to think it was a coolant problem - but it turns out it is just that the fridge temp is regulated and it is just crossed-fingers that the freezer stays cold enough - in a cold environment it needs a helping hand.
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell
When the debate is lost, slander becomes the tool of the loser. Socrates