Disclaimer
Baxi E20 Overheat Lockout is a common issue that homeowners with Baxi boilers may face. This issue occurs when the boiler overheats and shuts down to prevent further damage. When the boiler goes into overheat lockout, it can be frustrating for homeowners, especially during the colder months when heating is essential.
The Baxi E20 Overheat Lockout can be caused by various factors, including a faulty thermistor, a blocked heat exchanger, or a defective fan. If the boiler is not fixed promptly, it can lead to more severe problems, such as a damaged heat exchanger or a broken fan. Therefore, it is essential to address the issue as soon as possible to prevent further damage and ensure that the boiler is running efficiently.
In this article, we will discuss the common causes and solutions for the Baxi E20 Overheat Lockout issue. We will provide homeowners with the necessary information to troubleshoot the issue and fix it promptly. By the end of this article, homeowners will have a better understanding of the Baxi E20 Overheat Lockout issue and how to prevent it from happening in the future.
Understanding the Baxi E20 Boiler
The Baxi E20 boiler is a popular choice for heating systems in homes and businesses. It is a reliable and efficient boiler, featuring a parameter storage unit, but like any other heating system, it can experience faults and error codes. Understanding the different components and how they operate can help you identify and fix any issues that may arise.
Components and Operation
The Baxi E20 boiler consists of several components that work together to provide heat for your home or business. The Printed Circuit Board (PCB) is the brain of the boiler and controls all of its functions. The Parameter Storage Unit (PSU) stores the settings and parameters for the boiler.
The gas valve controls the flow of gas into the boiler, and the Flow Temperature sensor measures the temperature of the water flowing through the boiler. The Temperature Sensor measures the temperature of the water in the boiler, and the Safety Thermostat Sensor trips if the temperature gets too high, causing the boiler to shut down.
Common Error Codes
The Baxi E20 boiler can display various error codes, which can indicate different faults with the system. One of the most common error codes is the E20 Overheat Lockout, which occurs when the boiler’s temperature exceeds the safety limit. This can happen if there is a fault with the Flow Temperature sensor or the Flue Gas Temperature Sensor.
Other error codes that can display include E28 Flue Gas Temperature Sensor Fault, E168 PCB Fault, and E133 Gas Supply Fault. If you encounter any of these error codes, it is important to contact a Gas Safe Registered Engineer to diagnose and repair the issue.
In summary, the Baxi E20 boiler is a reliable and efficient heating system that can experience faults and error codes. Understanding the different components and how they operate can help you identify and fix any issues that may arise. If you encounter any error codes, it is important to contact a Gas Safe Registered Engineer to diagnose and repair the issue.
Diagnosing Overheat Lockout
When a Baxi boiler displays an E20 error code, it means that the boiler has overheated and has shut down as a safety measure. Diagnosing the cause of the overheat lockout, such as a fan wiring error, can be tricky, but it is essential to prevent further damage to the boiler.
Temperature-Related Faults
One of the most common causes of an overheat lockout is a temperature-related fault. This can be due to a faulty thermostat sensor, a safety thermostat issue, or a negative temperature coefficient (NTC) sensor fault. In some cases, the critical flue gas temperature may also be exceeded, causing the boiler to shut down. Checking these sensors and ensuring they are working correctly can help to diagnose and solve the issue.
Flow and Pressure Issues
Flow and pressure issues can also cause an overheat lockout. A heating flow switch error or central heating NTC error can cause the boiler to overheat. Additionally, a critical flow temperature or maximum flow temperature may be exceeded, causing the boiler to shut down. Checking the flow and return pipes, as well as the system water pressure, can help to diagnose and solve these issues.
Electrical and Temperature Sensor Errors
Electrical and sensor errors can also cause the boiler to overheat. A fan wiring error or air pressure switch fault can cause the boiler to shut down. Additionally, a DHW NTC sensor fault or neutral reversed error can cause the boiler to overheat. Checking the wiring and sensors can help to diagnose and solve these issues.
It is important to note that other error codes may be displayed alongside the E20 error code, indicating other faults that may be contributing to the overheat lockout. Checking for other fault codes and addressing those issues can help to prevent further overheat lockouts.
In conclusion, an overheat lockout can be caused by a range of issues, including temperature-related faults, flow and pressure issues, and electrical and sensor errors. Checking these components and addressing any faults can help to prevent further overheat lockouts and ensure the safe and efficient operation of the boiler.
Troubleshooting and Resolving Issues
Resetting the Boiler
If your Baxi boiler is displaying the E20 error code, you can try resetting the boiler to resolve the issue. To reset the boiler, turn the selector switch to the R (Reset) position and hold it for at least 5 seconds before releasing it. The fault code will be replaced with the boiler’s current temperature. At this point, the flame failure light will flash slowly to indicate that the boiler is in standby mode. If the boiler does not reset, it is recommended that you contact a Gas Safe registered engineer for further assistance. This could be due to a neutral reversed error.
When to Call a Gas Safe Registered Engineer
If resetting the boiler does not resolve the E20 error code, it is recommended that you contact a Gas Safe registered engineer for further assistance. A Gas Safe registered engineer will have the necessary skills and knowledge to diagnose and resolve the issue safely and effectively.
It is important to note that attempting to resolve the issue yourself could result in further damage to the boiler or even pose a safety risk. Therefore, it is always best to leave any repairs or maintenance to a qualified professional.
When contacting a Gas Safe registered engineer, it is important to provide as much information as possible about the issue, including any error codes displayed on the boiler. This will help the engineer to diagnose the issue more quickly and accurately.
It is also important to ensure that the boiler is properly calibrated and that any external devices, such as thermostats or timers, are functioning correctly. Additionally, if the boiler is displaying an internal clock time error, it may be necessary to reset the clock or replace the battery.
In summary, if you are experiencing an E20 error code on your Baxi boiler, you can try resetting the boiler to resolve the issue. However, if this does not work, it is important to contact a Gas Safe registered engineer for further assistance. Always ensure that the boiler is properly calibrated and that any external devices are functioning correctly. If the boiler is displaying an internal clock time error, it may be necessary to reset the clock or replace the battery.