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Thermador Oven Not Heating Up? FIXED

Your Thermador oven won’t heat up because of a lack of power supply, a malfunctioning thermostat, amperage problems, or faulty oven parts. To resolve this issue, first, check that the power supply meets 120V/240v for gas and electric Thermador ovens, respectively. If this doesn’t resolve the heating problem, call a professional, or follow the steps in this guide to identify and replace damaged parts.

My Thermador oven has served me well for over three years today, but I’ve had to deal with the heating problem a few times. Often, it’s just a power issue, so there’s no need to panic. Instead, this heating issue has common causes and quick DIY fixes you can try at home. In this guide, I’ll share with you all the possible causes of a Thermador oven not heating and simple ways to resolve the issue.

By the end of the post, you’ll be able to identify what’s wrong with your oven and have a way to fix it. Read on.

Why Is My Oven Working but Not Heating Up?

Oven Isn’t Receiving Any Power

Let’s start with the scenario where there’s nothing wrong with your oven. Instead, the problem is with the power source.

Here are reasons why your Thermador oven isn’t receiving any power:

How To Fix Power supply issues on a Thermador Oven

Here’s what you can do to make sure your oven is receiving power:

  • Check if the oven is plugged inThe plug may have been slightly dislodged, preventing power from flowing in. If it was, make sure the prongs go inside the socket.
  • Try plugging other electronic devices into the power socket. This is a simple way to check if the socket is providing power. If it isn’t, you need to look for another power source.
  • See if the circuit was tripped or a fuse was blown. If the circuit has tripped, you only need to reset it. However, if a fuse is blown, replace it or call a professional to do it.
  • Don’t use an extension wire for your oven. Extension wires are unsafe power sources for ovens as they may not provide enough power.
  • Look for broken wires. If there are damaged wires, this could affect the power connection and flow. Have those fixed or replaced.
  • Use a multimeter. A multimeter will decipher whether or not enough power is coming through the source.

Oven Cannot Start or Turns Off Immediately

It’s possible that the socket is providing ample power and the oven is receiving it properly. Still, it would not start, or if it will, it starts but turns off immediately. Either way, it will not be able to heat up.

How To Fix a Thermador Oven that Doesn’t Start

The oven door needs to be closed correctly for an oven to start. If the door cannot close, then it may lead to problems.

Here’s what you can do:

  • Check if the door is closed.
  • If you can’t close it properly, look for crumbs and other objects that may be lodged on corners or sides. These might keep the door from closing.
  • Remove the crumbs or other objects.
  • Close the oven

Thermostat Needs Adjustment or Is Faulty

A thermostat is crucial for proper oven operations. It detects the internal temperature of the oven. If it senses the oven is too hot or cold, it induces the oven parts to add or remove heat. Thus, if it were damaged, oven operations would be affected.

How to fix a faulty Oven thermostat

Refer to your appliance’s manual when adjusting or fixing a faulty oven on your own. If you lost your copy of the manual, don’t fret. Find detailed guides on Thermador’s Find Owner Manuals. In addition, you add, you need to provide your oven’s model number.

It’s also possible that your thermostat is faulty in the first place. If that’s the situation, have the thermostat replaced. But, it’s best to consult a professional for the repair.

Control Board Is Damaged

The control board is the interface or middleman between your oven and you. It receives and relays your instructions to the oven parts, allowing them to heat up. If there is a problem with the control board, it won’t be able to process your instructions correctly.

How To Fix a Damaged Thermador Board

If the control board is indeed damaged, that can be quite costly and complicated to fix. Before you rush into that, though, here’s what you can do:

  • Reset the oven by turning it off on the circuit board.
  • Wait for five minutes.
  • Turn the circuit breaker on again.

If that doesn’t work, you should call in a professional. Another scenario when you should consult service immediately is when the oven lights are on, but the display or controls aren’t working.

Circuit Amperage Isn’t Met

Amperage is the measure of the electric current passing through your circuit. For a double Thermador oven, problems with the circuit current may prevent the second oven from heating up properly. The required number of amperes won’t be met, or it won’t be the same as the house circuit (as it should be).

How To Fix Circuit Amperage on an Oven

A vent blockage may cause circuit current problems. Here’s what you should do:

  • Check your oven’s vent opening.
  • If there’s a blockage, remove it.
  • Check if your oven is working correctly.
  • If the problem isn’t resolved, seek a professional.

The oven’s heating Elements Are Damaged

Ovens may have baked or broiled elements. These are the parts most responsible for heating the oven. Unfortunately, electric current cannot flow through properly if the bake or broil elements have holes or other damages. Without current, your oven won’t heat up.

How To Fix Oven Heating Elements

Here’s what you should do:

  • Check if the heating elements are glowing red. If they aren’t, the heating elements may be damaged.
  • Check for holes or dark spots in the heating elements. These are other indicators of damage.
  • Call service. If you see any of those signs, consult home service to help replace the element. It may be too complicated to fix on your own.

Other Oven Parts Are Damaged

Besides the heating elements, circuit, control board, and thermostat, other oven parts help ensure it heats up and works properly. However, if those parts are faulty or damaged, they also prevent the oven from heating up.

These are some oven parts that would affect heating:

  • Malfunctioning convection fan.
  • Blown or faulty fuse.

How To Fix Broken Oven Parts

Here’s what you can do to fix broken oven parts:


Your Thermador Oven not heating up is nothing to panic about. Some common reasons could be a lack of power supply, broken oven parts, or a circuit amperage that’s not met. Follow the guides provided in this article to fix these issues and more. Get back to cooking as soon as possible with our quick fixes, or call a professional if you’re unsure.


  • Chris Hewitt

    Chris is a Texas-based freelance writer who loves the outdoors and working in his garage. When he's not enjoying the Texas sun, he can be found tinkering with all sorts of things in his workshop.

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