We have a 2000 nodel wall range/oven that stopped working a month ago. At first the thermostat would be set at 350 and the oven would get as hot as 400 degrees then the oven just started cooking at 600 degrees no matter what temperature it was set on. All of a sudden, three days before Thanksgiving, it stopped heating all together. So I replaced the thermostat ( what I thought was the most logical solution) and still nothing. Any suggestions. The clock work and the light inside works but the oven will not heat.