UK Appliance Repair Questions? Ask a Technician for Answers ASAP
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The F3 error means there was an issue with the defrost circuit. Can you hear a fan running in the freezer section? Can you see any frost on the back wall inside the freezer?
The multiple issues you are having sound like the main electronic control may have issues. Can you turn the power off at the mains or unplug it for an hour to see if the behavior changes?
I do not believe it will be a quick fix, it will require a new part. I understand your desire to replace the unit.