Error E4 Heaters Bosch

What is the fault of Bosch Error E4 affecting your heater?

A Error Code E4 is a common issue that can affect heaters from Bosch and also those from the Junkers brand. This error indicates that the air temperature sensor in the housing has detected overheating, and as a safety measure, the heater automatically shuts down. In this article, we will explain what this type of error is, its possible causes, and how you can practically and easily resolve it.

The air temperature sensor in the housing is a device that measures the air temperature circulating inside the heater. Its function is to prevent the heater from overheating and getting damaged. When the sensor detects a temperature higher than normal, it sends a signal to the heater's control panel, causing it to shut down and display the E4 error code on the screen.

The Error Code E4 can have several causes, including:

• Obstruction or dirt in the air filter of the heater: A clogged air filter can hinder the airflow, leading to increased temperature in the heater.
• Incorrect installation of the heater: Failure to respect minimum distances between the appliance and walls or furniture can impede ventilation and generate additional heat in the heater.
• Lack of maintenance of the heater: Dust, grease, and/or residues on internal components can affect the sensor's operation.
• Defect or malfunction in the air temperature sensor in the housing: If this temperature sensor malfunctions, it can send erroneous signals to the heater's electronic PCB, causing the E4 error code to appear on the screen.

Fortunately, this error code does not mean you have to replace your heater with a new one. Now, let's see how you can resolve this problem!

How to fix Bosch water heater Error E4?

The good news in all of this is that this issue may have a solution, and the best part is that you could try fixing it yourself without the need to call technical support. To resolve Error Code E4 on your Bosch heater, you can follow these steps outlined below:

1. Restart the heater to reset the sensors: Let's start with the easiest and simplest thing you can do, which is to restart your Bosch heater. To do this, turn off your heater completely and disconnect it from the electrical outlet for a few minutes. Then, reconnect it and turn on your heater to check if the error code has disappeared. Sometimes, this single and simple procedure can make various specific errors vanish from your heater's system.
2. Clean the heater's air filter: Locate the filter at the bottom or back of the device and carefully remove it. Clean the filter with a soft-bristle brush and warm water; if it's very dirty, you can use some soap and a bit of vinegar. Dry it thoroughly before placing it back. Turn on the heater and check if the error persists.
3. Inspect the physical installation of your Bosch heater: To do this, ensure that the heater complies with the manufacturer's recommended minimum distances between the appliance and adjacent walls or furniture. If necessary, move the heater or remove objects that may obstruct ventilation. Turn on the heater and observe if the error has been resolved by applying this solution.
4. Make sure to follow all the steps to the letter: If the problem persists, you may need to repeat one or two of the steps mentioned earlier. Please make sure to follow all the steps to the letter and don't overlook anything.
5. Request a technical review of the heater with Bosch technical support: If the above steps have not worked, the air temperature sensor in the housing may be damaged or defective. You can try replacing it, but in this case, it's best to contact the official Bosch or Junkers technical support to have your heater inspected and repaired if necessary. We are confident that they will provide all available guarantees and solve your problem practically and safely.

In summary, Error Code E4 in Bosch and/or Junkers heaters indicates an overheating problem in the air temperature sensor of the heater's housing. Possible causes include an obstruction or dirt in the air filter, incorrect installation, lack of maintenance, or a defect in the sensor. It may sound like a somewhat complicated issue, but here is a very brief list of possible solutions you can apply to resolve this problem:

• Restart the heater to reset the sensors
• Clean the heater's air filter
• Inspect the physical installation of your Bosch heater
• Make sure to follow all the steps to the letter
• Request a technical review of the heater with Bosch technical support

And for now, that would be all! We truly hope we've been able to help you solve Error Code E4 on your Bosch heater. Honestly, we believe that good preventive maintenance can help you prevent such annoying and inconvenient situations. Goodbye for now!