Humming, cycling and vibration can have several causes. An online symptom match does not establish which internal component needs replacement.
What the observation means
The exact model and revision also determine compatibility. Opening the unit to compare photographs exposes electrical and contaminated parts.
A useful next step
Use an appropriate assessment first and retain any previous report. Do not fit a capacitor, switch or valve as a trial or assume that a running motor rules out every other fault. Accurate observations support diagnosis without replacing it.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.