I have a jenn-aire oven that the oven temp is 50 deg cooler that the setting. Can it be calibrated? WW27430B

Jenn Air Recalibration.

How to Calibrate the Oven - Product Help - JennAir

https://producthelp.jennair.com > Product_Info > How_...
Aug 1, 2022 - Toggle through the settings and select either temperature calibration or oven calibration (depending on model).
Missing: JJW9630 ‎' Must include: JJW9630

How to Calibrate the Oven - Too Hot - Electric Range - JennAir

https://producthelp.jennair.com > ... > Too Hot
Apr 27, 2021 - The oven temperature can be calibrated to fit your needs. If you have determined your oven needs to be calibrated, below are the most common ...
‎Possible Solutions · ‎How to Calibrate or Adjust... · ‎New Oven and Too Cold

Well, your temp sensors can still be bad. If not, there's always a new control board you buy!

However, I wouldn't drink water from that oasis without making ABSOLUTELY sure I'm not seeing a mirage.

The only common denominators between your upper and lower oven temp readings is the firmware and the oven thermometer you are using to visually check the temps.
What type of thermometer are you using to check your oven temperatures with?
If it's not a digital thermometer used specifically for testing ovens, you might just be leading leading yourself astray.
You need a calibrated thermometer. If I don't have a calibrated digital thermometer on me, I use two or three oven thermometers (the dial type) and average the readings.
It's the only way to be as close as possible with a digital probe.

If you have thoroughly verified that your oven is in fact not reading the correct temperature, then you can adjust it +/- 35 degrees F via your oven's control panel.
To adjust the oven temperature:
1 - Press Setup pad.
2 - Select the down arrow to scroll to the next screen.
3 - Select Temp Adjust using the Quickset pads.
4 - Select upper or lower oven (select models).
-"Set temperature offset using the Upper Set Knob" is displayed.
5 - Enter the desired temperature change using the Set knob.
The temperature can be increased or decreased up to 35 degrees.
The temp. change is displayed at the top of the window.
6 - Press the Set knob to accept the change.

Now, if you are still worried about the temp. reading being off, replace both the upper and lower temp sensors. That's all you can do besides replace the main board.

Hi and good morning too you. First of all the normal oven swing is about twenty degrees, so your swing of thirty up is ok. I would center the swing, bake button, should see the offset screen. Change the setting to -10 and try again to check you temps. This drift you have is ok and by changing the offset should able you to control your overheating issue and center your swing.

Good Luck, feel free to ask for more help if needed.

I’m happy to help further over the phone at https://www.6ya.com/expert/gere_bf68e6055dd61249

check that the oven thermostat probe inside the oven is not close to or touching one of the upper oven elements

Without the Model Number I can only give you Basic instruction.

If your machine is Digital the best way to calibrate if find the manuel of your machine useing your Model number.

Some of the digital models : select bake and press and hold the up or down Temp button for 5 Sec to enter the calibration mode.

Some models require you do get the temp to over 400 deg befor you can enter the Calibration mode.

If your machine has a turn knob ... Take the knob off and see if there is a small screw in the center... This is the calibration screw.

Check this link:
http://www.abt.com/product/7523/Jenn-Air-JJW9627DDS.html

There is a calibration method to adjust the oven thermostat plus/minus 35 degrees if it is a digital display. The method varies depending on the model range. This calibration method is used to adjust the thermostat if it is not keeping proper tempature. For example if you are setting the oven to 350 and the actual temp it is keeping is 325 then you could use the calibration method to adjust it plus 25 degrees to correct the temp. Just so you know electric ovens will keep a pretty even temp but gas ovens will vary by 40 or more degrees to keep an "average" temp. For example the burner will come on when the oven is 330 degrees and turn off at 370. 330+370 then divide by 2=350. So a oven thermometer may not show you the temp you set it at in a gas oven but does not mean the oven temp is off.

The temp probe resistance should read between 1050 and 1150 ohms. If not. Replace it.It causes the overheating situation you describe.

Probably a bad oven temperature sensor.

It's on page 32 of the manual for Thermador's built in convection ovens. 1. turn off the oven 2.touch and hold the start pad and then touch the bake pad 3. 0 (zero) appears in the temp digits. release all pads 4. touch bake and 0 changes in increments. max adjustment is 35 degrees F. 5. to complete change touch start for lower oven on double ovens do this: touch the roast pad instead of the bake pad continue with steps 3-5.