Yes I did that on first installation and I have checked it since. However the water in the reservoir doesn’t taste salty now, so maybe the softener is using up the salt and just the indicator light isn’t working.
Today’s plan is to move this m/c to our holiday home in a soft water area where it won’t matter (in place of the SMS44 which is slow to fill – see thread 854983) and buy a new one for here, probably a SMS46IW10G as I remember you don’t think much of the cheaper models with plastic tubs!