Some controls require a separate Start or confirmation after choosing the mode and temperature. A displayed selection can be a proposal rather than an active programme.
What the observation means
Look for the model's running indicator, not just a number. Changing a setting during operation can also require confirmation. A blinking value may indicate that the interface is still waiting for input.
A useful next step
Use only the normal owner procedure and keep the sequence with any repair enquiry. If the programme is confirmed but repeatedly returns to standby, note the accompanying message. Do not hold multiple buttons or enter service menus in an attempt to bypass the normal start sequence.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.