The answer to 'my preventive maintenance keeps shutting off' is that there are a few common causes for this issue, such as a tripped circuit breaker, a clogged air filter, or a problem with the thermostat. This can be a frustrating problem, but it's important to identify and address the root cause to prevent further issues.
One of the most common reasons for a preventive maintenance system shutting off is a tripped circuit breaker. This can happen if the system is overloaded or if there is an electrical issue. You can try resetting the circuit breaker, but if it keeps tripping, it's best to call a professional HVAC technician to diagnose and repair the problem.