The answer to 'my maintenance won't turn on' is that there could be several common causes, such as a tripped circuit breaker, a faulty thermostat, or issues with the HVAC system itself. Symptoms may include the system not powering on at all or the fan not running.
To troubleshoot, first check the circuit breaker and reset it if tripped. Next, inspect the thermostat to ensure it's properly set and functioning. If those basic checks don't resolve the issue, it's likely an HVAC system problem that will require a professional technician to diagnose and repair.