[header] How to test an oven thermostat [title] Turn off the circuit that powers your oven. [step] Turn off and unplug your oven. Then, find the breaker box and look at the schematic on the circuit breaker door to find the switch that controls the electricity to your oven. 
Flip the switch to the off position to cut off the power. [substeps] Turning off the power to the oven will prevent you from being electrocuted.