You need to determine if the motor is running or not. If it is not running, the first thing I would check is if there is a sock stuck in the pump. This is not too terribly common, but easy to check.

There are a number of possibilities in your situation. So, it is hard to give a one size fits all answer.

If the motor is not running, the start capacitor (if it uses one) could be bad. The transmission could be bad (rare for this symptom) or the motor itself could be bad.

Oh, even the timer could be bad. If contacts go bad in the timer, the motor will just hum. This can be tough to determine with simple verbal advice.

Sorry to leave you with possibly more questions than answers. But, this is not an easy problem to troubleshoot on a forum without more information.

I am sure others will chime in with suggestions I may have overlooked.

Matt