What is the first step in troubleshooting if there are issues with main power?

The first step in troubleshooting issues with main power is to check if the main power disconnect is on. This step is crucial because the main power disconnect is designed to cut off the power supply to a system for safety or maintenance purposes. If the disconnect is off, there will be no power reaching the equipment or systems in question, rendering further troubleshooting efforts futile.

Establishing whether the power is available at the outset allows you to narrow down the source of the problem more effectively. Only after confirming that the main power disconnect is on should you proceed to other aspects of troubleshooting, such as checking for intact fuses, inspecting wiring connections, or measuring AC voltage. Each of these subsequent steps assumes that the power supply is active, which may not be the case if the disconnect is turned off.