Clicking that repeats but never starts the unit can be a bad relay, capacitor, or thermostat issue

https://trustedsamedayac465.rivetgarden.com/posts/low-refrigerant-ac-problems-signs-your-system-needs-attention

Clicking that repeats but never starts the unit can be a bad relay, capacitor, or thermostat issue. Check settings, then schedule diagnosis if the AC does not engage.