Is the Oven plugged into a grounded 3 prong outlet?
Ensure the countertop over is plugged into a grounded 3 prong outlet. See “Electrical Requirements" in the Owner's Manual for additional information. Check the outlet. If you are unaware if it's working, plug in a household lamp or other small appliance to verify that the outlet is working.
Is the fuse in the circuit to the Oven in working order?
If you have a circuit breaker box, make sure the circuit is closed. Try unplugging the Countertop Oven, then plug it back in.
Is the "Power On" light is flashing rapidly?
The oven has a 4-hour auto shut-off feature. If using the “Stay on” mode, the oven will automatically shut off after 4 hours and the Power On indicator light will flash rapidly.