Safety: unplug the appliance and close the water tap before any check, and never open the outer casing or electronic boards yourself.
Where scale forms
On heating elements, in spray arms and on sensors. A scaled heater takes longer and works under stress.
In the dishwasher
The salt system exists precisely for this; set the hardness level per the manual.
In the washer
A periodic drum-clean programme with a dedicated product reduces build-up.
Signs
Longer cycles, white film on dishes or heating-related error codes.
Frequently asked questions
Do I still need a technician after these tips?
If the problem continues after the safe steps above, it's best to request a technician's check.