Vulcan 260 l series thermostat calibration. the knob went beyond 500 degrees and since then the oven is not the right temp. its as though 300 is 5oo and 500 is 700 how to fix

Various ideas in the videos, but one of the articles said that Bertazzoni had a batch of bad thermostats. That model is discontinued/

https://www.google.com/search?q=bertazzoni+pro304inmxe+30+calibrate+oven+temperature

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Contact the manufacture, it is most likely going to be covered under warranty. If the knob is not removable, (check for a set screw on the side of the knob it will take a small allen wrench) Then the thermostat (temp controller) will need to be replaced, if it isn't a style that you can calibrate.

If you pull the knob off there is a very little screw in there that you can turn with a small screwdriver. I believe left is increase and right is decrease, but I could be wrong. Very little turns do a lot. You can tell if you are going the right way if the burners get bigger or not. This takes a while so do a 1/4 turn and let it sit for a while, take temp and adjust again if needed.

To Adjust the Thermostat

Pull the OVEN TEMP knob off the shaft. look at the back of the knob and note the current setting before making any adjustment. The knob is factory set wit the knob directly under the pointer.

1. Pull of the OVEN TEMP knob

2. Loosen both screws on back of the knob

3. Adjust lower screw so it moves in the desired direction. You will hear and feel the notches as you turn the knob. Each notch changes the temperature about 10 degrees F.

4. Tighten the screws.

5. Return the OVEN TEMP knob to the oven.

Re-check oven performance and make the necessary adjustments accordingly.

Buy an oven thermometer to check if the temperature you set the oven at is accurate. You may have a faulty thermostat, but if the temp is only off by a little, you can calibrate the temp setting on the oven by as much as + or - 25 degrees. If you have an LCD screen, then most likely you can adjust it right on there. If not, then the backside of the oven knob can be adjusted + or -. by moving a set screw and turning as needed. Your owner's manual will have a more detailed explanation on this procedure. Douglas

You will need to check the oven calibration using a thermocouple based thermometer(the one you stick in the oven is not reliable). Electric ovens should keep a near constant tempature so if you have it set to 350 the oven should stay around 350 once temp is reached. Now gas ovens are a little different. Most use a on/off thermostat and that means the temp can vary from 320 degrees to 370 degrees to keep an average tempature of 350. So if it is a gas oven you will need to let it warm-up for 10 minutes then start taking the lowest and highest 5 consectutive readings. Then add the 5 reads together and then divide the number by 5 and it should be within 10 degrees of the set tempature. If it is off by more than 50 degrees then you might not be able to get it back to proper calibration. The calibration methods are different for each range and depend on the type of thermostat you have digital(push button controls) or manual(knob). The owner's manual for your range might contain the instructions or consult the manufacture's website for the instructions.

Are you checking with a store bought thermometer or your recipe. If it is your recipe then ur thermostat might need a calibration or need to be changed completely if it is really off by more than 100 degrees. If it is 99 or less a simple calibration may just do it. If you have a steady hand. With your thermometer inside the oven and the door closed set at 350. Then take the oven knob off and take a small flat screw driver (really small). And insert it in the valve part where the knob was. With a flash light u can see the small screw. Turn it a hair at a time (1-2mm). Wait 20 minutes and see if the temp does rise. If not turn another hair. Repeat until 350 is reached. You must wait the 20-30 minutes for it to reach the temp. If all else fails changing the thermostat would be next. I do not recommend u do this alone. approx cost is: $400 - 500 front access, 500 - 600 rear access Good luck.

Good Evening.


I would make sure that the conversion kit was the correct kit for your stove. Also, if it is not heating properly I would call the gas company and tell them the conversion did not work and they need to double check their work (at no charge). If everything is in order proceed to the next step below.


You can try removing the Oven Temp control. There is an adjustment on the knob which will vary the temp + or - 75 degrees F or so.

Procedure: Preheat your oven for 350 degrees F. Give it a good 1/2 hour to 45 minutes and then pull the knob off (usually held on with a set screw) You will need a thermometer that will go up to 500 degrees (I use an electronic one but you can use any kind as long as it is within the ovens temp range. If the oven is underheating simply turn the oven control stem to a higher setting, say a 50 degree incrament. Wait another 1/2 hour and measure temp inside oven. Keep in mind when you open the oven door it affects recovery time, etc so 30 minutes between a measurement and adjustment should suffice. Once you have adjusted the temp control to your target temp of 350 degrees look on the back of the knob and see if there is a stop adjustment. There is a chance the temp control knob could be setup differently but the same philiosphy/procedure will be similar.- the adjustment could be on the stem itself instead of the knob.

Also keep in mind that the oven temp will fluctuate from high to low as it tries to adjust to the temp it is set at. That is why it is very important to give the oven time to cycle low to high when you incrament the temp control. Hope this helps and good luck! Gary

Try to set it at 500 degrees and see if it goes off at 350. If it does, then it probably needs calibrating. You can calibrate it by taking the knob off and finding a set screw in the stem where the knob sits. If this is not the problem, you may have to replace the thermostat. By the way, check to see if your temperature probe is not touching the wall of the oven. It will give it a false reading. Let me know if any of these things work and we will go from there.

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.