Oven not heating

Have a Whirlpool Accubake self cleaning wall oven that quit working after doing a cleaning. Found that the thermal overload safety thermostat might be the problem. Ordered the part which arrived in a couple of days. Installation was very easy and took about 10 minutes. First turn off power to the oven. Slide the oven out, remove the back panel, remove the old safety thermostat which has two wires coming off of it, and replace it with the new one. Put the back panel on and slid the oven back in. Turned the power to the oven back on and we had heat. Problem solved.