UK Appliance Repair Questions? Ask a Technician for Answers ASAP
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If it is all working but with no display, the main electronic control likely just needs to reset. The low voltage user interface controls rarely fail. Unplug the refrigerator for an hour or so and see if it will reset. Does the behavior change at all?
You have to press and hold the LOCK buttons to unlock the control. Are you holding the buttons?
Okay, keep me posted. Did you get a chance to power down for a bit to see if that reset anything?