As a general rule, what is the first troubleshooting action to be taken in checking inoperative electric circuits?

Correct Answer: Option C — test all fuses and measure the line voltage

Systematic troubleshooting begins with verifying the power supply. Testing fuses and measuring line voltage at the load terminals immediately identifies whether the issue is a loss of power or a fault within the control/motor circuitry, saving time and preventing unnecessary disassembly of functional components.