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thermador oven not heating

Why Is My Thermador Oven Not Heating Up?



While Thermador ovens are renowned for their superior performance, they can still fall victim to common heating issues. Why won’t my Thermador oven heat up? For gas ovens, a faulty igniter could be to blame, while electric models may have a failed heating element. Troubleshoot a Thermador oven not heating up with these likely causes.

4 Possible Reasons for a Thermador Oven Not Heating Up

Though a lack of heat may seem like a deal breaker, there’s usually a straightforward cause for a Thermador oven not heating properly. From power issues to a blown thermal fuse, here’s how to determine the right fix.

Why Won’t My Thermador Oven Heat Up?

If your Thermador oven won’t heat, or isn’t giving you desired results in the kitchen, it may be due to several factors. The first thing to check is whether or not the oven is turned on. This is a common mistake, and this can be frustrating when dinner takes longer than expected. 

If the oven is on, the next thing to check is the thermostat. The thermostat can be adjusted depending on how hot you want your oven to be, so if it’s not set correctly, that could be why your food isn’t cooking properly. 

Finally, another potential issue could be that the heating element itself is damaged or not working properly. If this is the case, you’ll need to contact a professional for repair or replacement. 

oven won't turn on but burners work
Image Source: Thermador

But with a little Thermador oven troubleshooting, you should be able to identify and fix the problem so that your Thermador oven is back up and running in no time.

How Do You Repair A Thermador Oven?

If your Thermador oven is not heating, there are a few things you can check to try and repair it. First, check for incoming power issues. Ensure that the circuit breaker the oven is connected to has not tripped.

If the oven shows adequate power, check to see if the oven’s bake element is burned out. To do this, simply look at the element through the oven window. An oven bake element must be replaced if it is black and not glowing.

Next, check for a faulty igniter. An igniter that takes longer than 90 seconds to ignite is likely faulty and will need proper diagnosis and replacement. 

Lastly, you can check the thermostat. This component controls the temperature of the oven and can occasionally fail. If the thermostat is not working properly, it will need to be replaced.

If your oven is not heating at all, it may have a blown thermal fuse. A blown thermal fuse must be diagnosed by a professional and replaced for the oven to work properly once again.

For further in-depth information on a Thermador oven not heating up, we will review these common causes and solutions below.

Thermador Oven Incoming Power Issues

Before assuming a malfunction, first, make sure your oven is receiving electrical power. Even gas ovens require electricity to spark the igniter and power other functions.

oven not getting hot

Here’s how to check for power issues when your Thermador oven isn’t heating at all:

  • Make sure the power cord is plugged in properly: The cord should be free of damage and fully plugged into a working outlet.
  • Test the outlet: Gas ovens require a standard 120V outlet, while electric models need an outlet with 240V of power. Test the outlet with a multimeter to make sure it’s providing the correct voltage.
  • Avoid extension cords: These cords can’t properly transmit the voltage an oven requires, causing surges that interrupt power.
  • Look for tripped breakers: Check your home’s circuit breaker box and reset any tripped breakers.

Faulty Igniter

In gas ovens, a faulty igniter is one of the most common reasons for an oven not heating up. The igniter must be able to perform two important functions that are essential to sufficient heating. First, it must gather enough electricity to open the safety valve that allows gas to flow. Next, it has to generate an electrical spark to ignite the gas. If the igniter can’t perform one or both of these functions, the oven won’t heat up at all.

To determine if the igniter is faulty, observe it as it tries to ignite the gas. If it takes more than 90 seconds to light the gas and the igniter shows no continuity with multimeter testing, it requires replacement.

Failed Heating Element

For electric models, a failed heating element may be why a Thermador oven is not heating properly. Electric ovens have a heating element at the top and bottom of their interiors. These metal coils contain wiring that generates heat when it receives electrical current. When functioning properly, the heating elements produce a steady, even heat and a uniform red glow. An interruption in electrical current, faulty wiring, or damage to the coil itself can cause the element to fail.

why won't my Thermador oven heat up
Image Source: Thermador

When troubleshooting a failed heating element, look for the following signs:

  • Uneven cooking: Depending on which element has failed, food may be raw or undercooked on the top or bottom.
  • Visible damage: Breaks or dark spots on the heating element can interrupt the flow of electricity, resulting in insufficient heating.
  • Interrupted red glow: If the heating element glows red in some areas but remains dark in others, the element isn’t heating properly.

If multimeter testing confirms that the heating element has failed, it must be replaced.

Blown Thermal Fuse

Is your oven not getting hot at all even if it has power? The thermal fuse may have blown. The thermal fuse blows if the oven is in danger of overheating, protecting other components from damage. Once it blows, the fuse can’t be repaired and must be replaced for the oven to heat up. 

However, before replacing the fuse, a repair service should assess why the oven was in danger of overheating. Faulty wiring, a failed temperature sensor, or a defective control board could result in overheating that will repeatedly cause the fuse to blow. These issues require a professional Thermador oven repair.

Oven Won’t Turn On But Burners Work?

Check Oven Settings: If your oven burners work, but the oven won’t turn on, first make sure to check oven settings. For the oven to start, the power must be turned on and a setting and temperature selected. As this method varies depending on the oven model, consult your user manual to determine how to properly select the function and temperature. Some ovens have a digital display with buttons, while others have a rotary knob that enables you to make selections.

why won't my thermador oven heat up
Image Source: Thermador

Also, remember that your oven won’t turn on after a self-clean cycle until it’s sufficiently cooled. Even if the self-clean cycle has ended, the door will remain locked and additional functions can’t be selected until cooling is complete. At this point, the door will unlock, depending on your model oven. The oven may also make a chiming sound indicating that the cycle is finished and the oven is ready for use.

Oven Electronic Control Board Has Failed

Many oven models have an internal electronic control board that governs all functions. It sends electrical power to the appropriate function at the right time. If the wiring in the board shorts out or fails over time, it may not respond to your control panel commands. Even after selecting the right functions, your Miele oven won’t turn on, but burners work fine.

Due to its location and the skill required to test an electronic control board, it’s best assessed by a professional oven repair service.

The experts at RD Appliance Service, Corp can fix a Thermador oven not heating and address any other oven concerns. Schedule your service today!

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