[brstsmith]

Oven heats fine for short usage ,but three or more hours on low or high temp it shuts down.Replaced thermal overtemp.,same problem.Removed and checked electronic timer board for cold or burnt component.Looks fine,also checked relay board for same. Elements read fine and connectors clear. No codes appear. Timer is $200.00 so Would like to confirm if it could be problem before purchase.

[eric shubert]

maybe the over temp switch is working fine, check the blades on the cooling fan to see if dirty, door gasket fine????. if you have a temp probe that fits into a muilt. meter check to see if the area is getting to hot

[brstsmith]

fan and ducting is clean and starting and stopping with theral sw. on vent tube tube. I bypassed main thermal and the controller still loses its set temp.(goes dark) after 3 hrs.and will not adjust to temp. again until it cools completely down.