The laundry has a sequence. So does a useful note.
For a washer or dryer, the point at which a change appeared can be useful context. Describe the last normal use; do not run a faulty machine to create a new example.
Where in the programme?
Choose the point you remember. These are prompts for a description, not checks to perform.
Observation / 01
What did the controls show?
Note the programme you selected and any display message you saw. If nothing happened, describe that without deciding which component caused it.
If the equipment appears faulty, stop using it and seek qualified help. Do not remove panels or attempt an electrical repair.