When used (i.e. when a glass is placed on the shelf and the flap/lever is pushed back) the display flashes on and off whilst the dispenser makes a grinding sound.
Re: Whirpool Side by Side Fridge Freezer Model 858617215000
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this usually means the front pcb (in your user control) is at fault and requires replacement.
Alternatively, depending on your level of expertise, check the forums on changing capacitors in these boards, some users have had success by repairing the pcbs’ themselves as these boards are usually over £100 a throw.