Bosch Oven Not Heating? Here’s Why and How To Fix it)

If your Bosch oven is not heating up, The most common reasons are that it is in ‘demo’ mode, there is low electrical power on your circuit breaker, or one of its heating components has been broken.

However, other factors could be at play, so it’s essential to diagnose the problem accurately before taking action. By identifying the underlying cause, you can determine the most appropriate solution and get your Bosch oven heating up properly again.

If you love cooking and baking, just like me, you can relate to how annoying it is when your oven does not heat up. According to Liberty Home Guard, one of the most common oven problems most people experience is the oven not heating up. Imagine waiting for a mouthwatering dish for hours, and then when the timer goes out, uncooked food will welcome all the frustrations and longing you have for that dish. So, if you’re feeling frustrated, you are definitely not alone. 

This article will walk you through the possible reasons why your Bosch oven is not heating up. It will also provide you with the necessary actions to fix these issues and have your food ready in no time. 

Reasons Why Your Bosch Oven is Not Heating

Here are some of the possible reasons why your Bosch oven is not heating up:

• The oven is set to “Demo.”
• The circuit breaker provides less electrical power. 
• A heating element is broken. 
• The oven igniter has been damaged. 
• The temperature sensor is faulty.

The Oven is Set to ‘Demo’ Mode

The ‘Demo’ mode is a sales assistance tool that allows prospective Bosch oven buyers to become acquainted with the appliance’s functioning. A qualified technician connects a Bosch oven in demo mode to 120V within a junction box that meets the NFPA/NEC Guide to Wire and Box Installations while on display. 

Since a fully operating Bosch oven should be connected to a 240V outlet, the device will not heat up. It will not heat up when you first use your range because it is still in demo mode. As a result, you must first modify the settings.

How to Disable the Bosch Oven’s ‘Demo’ Mode

To turn off the Bosch oven’s “Demo” mode and get it to heat:

1. Choose the ‘Settings’ option. 
2. Scroll through the menu using the arrows on the display screen and select the ‘Demo Mode’ option. 
3. Set the “ON” setting to “OFF.”
4. To save the changes, press the ‘Enter’ key. 

Unless there are additional concerns, your Bosch oven should begin heating regularly, allowing you to use it effectively.

The Circuit Breaker Provides Less Electrical Power 

The circuit breaker (or fuse box) regulates the electrical charge to your Bosch oven before it is sent to the oven’s components via the control board. The manufacturer always specifies the size of the circuit breaker to which your oven should be attached. 

As a result, connecting your oven to a circuit breaker with a lower voltage than specified for your model will result in the oven not heating up. In addition, the oven circuit breaker will continue to trip.

How to Fix a Circuit Breaker with Limited Electrical Power 

If you want to be certain that your Bosch oven is linked to the proper-sized circuit breaker, have it installed by an experienced Bosch oven specialist. Check the amperage (A) shown on your breaker and the amperage specification on your model’s user or installation manual if your oven is already installed and you suspect breaker size difficulties.

For example, the Bosch 800 Series HBL8451UC 30′′ single wall oven has a 30A rating. The oven will not heat up if connected to a circuit breaker with a lower amp rating. Call the installer or a skilled electrician to correct the installation problem. You should not attempt to address this problem on your own since you risk further harming the oven or electrocuting yourself.

A Faulty Heating Element

As you start a cooking cycle, the heating element turns electrical energy into heat energy circulated in the oven cavity. This does not occur if an oven heating element is damaged. 

There are various techniques to determine whether or not a heating element in your Bosch oven is broken.

• When the oven is switched on, the element does not light up red or orange. 
• The component exhibits symptoms of wear (e.g., cracks, blisters, or a break). 
• The element shows no resistance or voltage when checked for continuity using a multimeter. 

It is important to remember that a faulty Bosch oven heating element should be replaced.

How to Change a Faulty Bosch Oven Heater Element 

Bosch advises against attempting to fix a broken oven heating element yourself. Because ovens use high-voltage electricity, you risk an accident if you don’t complete the repair correctly. Alternatively, contact Bosch Customer Service at 1-800-944-2904 or via the Bosch Oven & Ranges Help Page. 

But if you have experience working with electrical equipment or feel confident in your abilities, here’s how to repair a broken Bosch oven heating element:

1. Ensure no power gets to the oven by flipping the circuit breaker switch.
2. Pull the range from the wall.
3. Unscrew the back panel and place it aside.
4. Remove the heating element connection wires. Be sure to mark where each wire goes.
5. Take out the screws holding the heating element from the back.
6. At the front, open the oven and remove its racks. 
7. Unfasten the screws holding the baking element. You can also remove the oven door if it makes the work easier (though you should be aware that you’ll have to reinstall it afterwards).
8. Pull out the heating element.
9. Place the new element where the old one was and fasten the holding screws.
10. Put back the racks and replace the door (if you pulled out the latter). 
11. Replace the screws at the back of the oven and reconnect the wires. 
12. Place the rear cover back on and screw it on.
13. Power the oven and test if it now resumes heating.

You also might want to look at these instructions from how-2-repair.com’s YouTube video:

A Defective Oven Igniter 

Your Bosch gas oven needs both gas and electricity to operate. Although the burners use gas, an electrical current is required to power the igniter. 

When you light your igniter, the gas safety valve detects whether the igniter is sufficiently hot and permits the gas to light the burners. 

No heat is generated if the igniter fails and the safety valve does not activate the burners. This is why your oven is not heating. 

The first step to take regarding this issue is to replace a malfunctioning oven igniter.

Replacement of a Bosch Oven Igniter 

In case you need to replace your Bosch oven igniter, you can easily follow this 13-step guide:

1. Turn off the gas and the power to the range.
2. Remove the rear panel of the oven to access the igniter wire.
3. Release the igniter wire from the harness.
4. Remove the oven door. 
5. Take out the oven racks.
6. Unscrew the bottom panel inside the oven and remove it.
7. Remove the screws holding the igniter to the burner, and take the igniter out.
8. Place the new igniter in the position of the old one and screw it to the burner.
9. Pass the wire of the newly installed igniter to the rear.
10. Replace the bottom panel, racks, and oven door.
11. At the back, reconnect the igniter wire to the harness.
12. Screw the rear panel back to its original position.
13. Turn on the power and gas, and check if the oven resumes heating.

A Damaged Temperature Sensor 

The temperature in the cavity is detected by a Bosch oven temperature sensor, which informs the control board to cycle power to the heating element as needed. 

If the temperature sensor fails, it may constantly report no heat, preventing the control board from cycling the oven to heat. Just like any damaged or defective oven parts, a faulty temperature sensor must be replaced.

How to Replace a Bosch Oven Temperature Sensor

Follow these seven steps to replace a bad Bosch oven temperature sensor:

1. Turn off the power to the oven and unplug the power cord.
2. Remove the rear panel by taking out the screws.
3. Find the sensor wires at the upper right and press the tabs on the wire harness to release the sensor. 
4. Remove the screws holding the sensor and pull it out of the oven.  
5. Push the new sensor into the oven and secure it with the screws.
6. Reconnect the sensor to the wire harness.
7. Plug the oven in and switch on the power. The oven should start heating normally.

It is worth noting that Bosch always suggests that a professional replace oven parts. Only proceed with following troubleshooting procedures if you are certain you can do so safely.

According to Consumer Reports 2022 Appliance Brand Reliability Rankings, Bosch is the sixth most trustworthy appliance brand. This is due to their overall dependable and efficient goods, which include ovens. But even the greatest things might occasionally malfunction, such as your Bosch oven not heating. 

Regardless of the brand, you may still run into a number of intricate and perplexing issues that cause your oven to heat inefficiently or not at all. But remember that before performing any action, especially if it involves any electrical wiring, you should obtain professional assistance.

In conclusion, when having trouble with your oven while craving and starving, it is acceptable to be frustrated, annoyed, and disappointed. But feelings aside, you must first figure out what is wrong and try a few fixes, and then you surely will have it in no time.  

Fred Wolf

Hunter Hayes is a seasoned wordsmith with an obsession for all things related to Home Improvement. With years of experience in the subject, he brings to TemperatureMaster.com a unique blend of technical understanding and approachable writing. Hunter’s articles not only explain complex thermodynamic ideas, but they also provide practical advice for day-to-day temperature management. Hunter’s intelligent contributions will keep you well-informed and comfortable in every circumstance, whether you’re intrigued about climate science or looking for help on optimising your home’s HVAC system.