1. If it hums it's the capacitor needing replacing
2. If it won't stop, the microswitch needs replacing
There are other less frequent problems
...but you've had yours apart so it could be there's something under the rubber diaphragm pushing on the microswitch ~ like one of the rubber pegs that happened to drop off whilst you were putting it back together
Thank God there are some owners willing to do their own cleaning work
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