The answer to 'my EV charger installation won't turn on' is that there are a few common causes, including a tripped circuit breaker, loose connections, or a faulty charger or electrical system. First, check your circuit breaker to ensure it hasn't tripped. If the breaker is fine, inspect the electrical connections to the charger to make sure they are tight and secure. If the connections look good, the issue may be with the charger itself or the electrical system it's connected to.
If you've checked the basics and the charger still won't turn on, it's best to call a licensed electrician to diagnose and repair the issue. Electrical work can be dangerous, so it's important to have a professional assess the problem, especially if you're unsure of the cause.