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thermador oven not heating

Why Is My Thermador Oven Not Heating Up?



While a Thermador oven is renowned for its superior performance, it 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.

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 the reason for a Thermador oven 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? It’s possible the thermal fuse has 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.

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