only the 30 seconds button works the light is on
what do I need to replace in order for it to work and how do I do that
please help

maria Jurewicz, November 2017

You take to someone who understands what they are doing and is competent to work on it.

That is especially important if it is a commercial model, in a kitchen used by employees. You really REALLY do not want to risk the life of an employee by a DIY repair by someone with no competence or qualification.

adsagf, November 2017