How to Troubleshoot & Replace Bosch AP4075269 / 00642855 Wall Oven Temperature Sensor

Guessed it must be either a heat sensor or a lower element. Bosch wall oven with no easy access to the back of the stove. Had to remove the door (very Heavy) to more easily access the temperature sensor. I thought from a video that the sensor could be easily replaced without having to access the red of the stove - not true! The sensor wire was secured to other wires and a clip screwed into the sheet metal. I was able to remove all screws with a Torx head driver. Since I had to pull the unit out and away from the wall enclosure I decided to replace the lower element anyway because the sensor tested just barely in speck by my ohm meter. After replacing the sensor and lower element the problem was fixed. I suspect that the sensor was at fault even though it tested in the lower range of being functional. Because the lower element was hidden under the stove floor and I already had to take the sheet metal off the back of the stove to free up the heat sensor it made sense to me to replace the element. Bottomline - works great and I would have hated to see what an appliance repair person would have charged to travel 17 miles one way to do the repair and charged me. 

Did research online, found a matching story at appliance parts pros. Tested the sensor, which was fine. Ordered a new control board and also a new sensor, replaced both, and voila works like a charm. I appreciate that this is a genuine Bosch part, 100% match. It is a build-in oven, so it took some work to pull it out and remove the microwave fixed to the top of the oven to reach the control board. But it was not difficult. I recommend taking lots of pictures before taking things apart, so that you have a reference to look at when putting it back together. This is especially important with connectors to the control board. If you have several identical connectors, mark them with a sharpie before taking the picture. It was very satisfying fixing this myself, definitely better than waiting for a repair guy to show up in some inconvenient long window. 

Replaced the lower heating element and heat sensor in a Bosch Double built in oven. It took two people to slide the oven out and set it on stand so that we did not have to lift it. Changing the element was easy as well as the heat sensor. Less than 15 minutes after the oven was out. Fortunately, I did this project because upon pulling the unit out we discovered that the original installers had been very negligent in the electrical hookup which was too short, pulling out of the box due to an improper connector and they simply put electrical tape around their laziness. I rewired the unit with a proper cable of the correct length and connectors. Everything is now working properly and safe. 

Replaced the sensor and bottom heating element just to be safe. The sensor can be changed from the front, the heating element requires you to move the oven out of the wall. There are clips you need to hold down when installing the heating elements but otherwise it's pretty straightforward. The oven no longer stops at 285 but it's still about 25 degrees lower than the setting. This is ok as long as it's consistent and it has been. Think maybe a circuit board needs changed but these replacements at least allow us to use this $1800 oven. 

Replaced the lower Heating Element and the Temperature Sensor. The Sensor was easy to replace but the element was pretty difficult due to the amount of insulation covering the element. It was also difficult to access the element. I had to pull out the oven from the wall, remove the back plate, bend out some of the metal plates holding it in, remove the old element which was corroded and broken into several pieces and welded to the support, then try and shove in the new one without displacing too much of the insulation. Finally got it in but I have no idea if the insulation is evenly distributed. Was much easier to access in my old GE oven. 

Found a local technician, that allowed me to order parts directly. 

Replaced the oven bake element and the sensor. I don’t think that the sensor was faulty, but replaced anyway. The replacement was fairly easy, but there are 2 clips that hold the element and the element’s front crossbar will snag on the clip that holds the rear cross member. To solve this and prevent the rear clip grabbing the front cross member, used a saw as a guide to cover the rear clip and act as a ramp for the element. Once the front cross member has passed the rear clip, the saw can be pulled out. A long ruler could be used instead. 

Replaced sensor. 

Replaced control board and Temp sensor 

Installed two new sensors since it is a double oven.