Normally, it would just be a case of buying a new timer, but this model is so old, very few spares are available. You would need to look at the wiring behind the timer and see if you can just bypass it altogether. You could try Simpson / Electrolux direct for a timer, wiring diagram, or suggestions. Contact details are in this page.
https://www.manualslib.com/manual/716378/Simpson-904.html?page=32#manual
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