Step 1 · Turn Off Power to the AC Unit

Before performing any maintenance, it is crucial to ensure your safety. Go to your main electrical panel and identify the circuit breakers that control your air conditioning system. Typically, there will be one for the indoor air handler (furnace/fan coil) and another for the outdoor condenser unit. Flip both breakers to the 'OFF' position. If you are unsure which breakers control your AC, turn off the main breaker for the entire house.