What the symptom can mean
A failure appearing only at a stage transition can involve the newly requested function, but the supply and controls also need consideration. Repeated trips are not a safe diagnostic test.
Give the last normal process
Say whether it was washing, emptying, spinning or drying when the display disappeared. Mention a known supply interruption as an observed fact, including what happened elsewhere in the property.
Describe the return state
Record what the panel showed when power was available again and whether water remained visible. The return screen and lost settings can be useful without repeating a trip or attempting a live electrical test.