What the symptom can mean
A closure condition, selected delay or failure in the starting sequence can prevent a programme beginning. A lit panel alone cannot establish that the door has locked or the machine has started filling.
Follow the ordinary start sequence
Tell us whether pressing start changed an indicator, locked the door or produced a sound. Retain any delayed-start or lock symbol. Give the actual order of those events rather than reporting only that the machine is dead.
Identify the stopping point
A door that does not latch, a latch that clicks repeatedly and a locked door followed by silence describe different stages. Mention visible obstruction or changed door alignment without forcing the latch to demonstrate it.