Disclaimer
When it comes to boilers, boiler errors can be a common occurrence. One such fault is the Baxi E78 Water Pressure Sensor Fault. This fault occurs when the boiler control system identifies a problem with the sensor that monitors water pressure in the system. It happens when the water pressure reading inside of it is not being read properly.
The water pressure sensor fault can be caused by a number of things, including a faulty sensor or a problem with the wiring or connections. It is important to get this fault fixed as soon as possible, as it can cause the boiler to shut down and stop working. If you are experiencing this fault with your Baxi boiler, it is recommended that you contact a qualified engineer who can diagnose and fix the problem.
Boiler errors can be frustrating, but with the right knowledge and expertise, they can be easily fixed. If you are experiencing the Baxi E78 Water Pressure Sensor Fault, don’t hesitate to get in touch with a qualified engineer who can help you get your boiler back up and running in no time.
Understanding the Baxi E78 Error Code
When a Baxi boiler displays the E78 error code, it is one of the many boiler error codes that indicate a problem with the water pressure sensor. This fault occurs when the boiler control system identifies an issue with the sensor that monitors the water pressure in the system. Understanding this error code can help homeowners diagnose and fix the problem quickly.
Identifying Sensor and Circuit Issues
The E78 error code may indicate that the sensor is not working correctly or that there is a problem with the circuit that connects it to the boiler’s control system. In some cases, the sensor may be not or badly connected, causing it to give incorrect readings. In other cases, the sensor may be damaged or faulty, causing it to give incorrect readings. In other cases, the circuit may be short-circuited or damaged, preventing the sensor from communicating with the control system.
Analysing Temperature and Pressure Faults
Temperature and pressure faults may also cause the E78 error code to appear. The temperature sensor plays a crucial role in detecting these faults. The boiler may have reached its maximum safe temperature value, or a temperature fault may have occurred due to a malfunctioning sensor. Additionally, the critical flue gas temperature may have been exceeded, or the maximum flow temperature may have been exceeded. If the system water pressure is non-existent or insufficient, this may also trigger the E78 error code.
Homeowners should ensure that their boiler and heating system receive regular professional maintenance to prevent future fault codes like E78 and others. Regular maintenance can help identify and resolve issues before they become more significant problems. If the error code persists after attempting to resolve it, it is best to contact a qualified engineer to diagnose and fix the problem.
In summary, the Baxi E78 error code indicates a water pressure sensor fault, which can be caused by a variety of issues, including sensor and circuit problems, temperature and pressure faults, and non-existent or insufficient system water pressure. By understanding the possible causes of this error code, homeowners can diagnose and fix the problem quickly and efficiently.
Diagnostic Procedures for Baxi Boiler Errors
Evaluating Common Boiler Error Codes
When a Baxi boiler encounters an error, it displays an error code on the digital display panel. The E78 error code, for instance, indicates a pressure sensor error that needs to be addressed. The error code is a combination of letters and numbers that indicate the nature of the problem. Some of the most common error codes that Baxi boilers display include E78, E15, E20, E28, E40, E50, 118, 125, and 133. Each error code corresponds to a specific problem that needs to be addressed to restore the boiler’s functionality.
Troubleshooting Sensor and Switch Failures
Baxi boilers rely on various sensors and switches to operate effectively. A heating flow switch error can occur if the flow temperature is increasing but the radiators are not getting hot. These include the air pressure switch, heating flow switch, safety thermostat, and heating thermistor sensor. If any of these components fail, the boiler may display an error code and stop working.
To troubleshoot sensor and switch failures, the first step is to check the temperature measured by the boiler. If the flow temperature is increasing but the radiators are not getting hot, it may indicate a problem with the heating flow switch. Similarly, if the safety thermostat sensor has tripped, the boiler may shut down to prevent overheating.
Another common issue that affects Baxi boilers is a water pressure sensor fault. This occurs when the boiler control system identifies a problem with the sensor that monitors water pressure in the system. To diagnose this problem, homeowners should check the water pressure gauge to ensure that it is within the recommended range. If the pressure is too low or too high, it may indicate a problem with the water pressure sensor. Another issue that may arise is an internal clock time error, which requires resetting the clock time due to incorrect configuration.
In summary, when a Baxi boiler displays an error code, it is important to evaluate the problem and troubleshoot any sensor or switch failures. By following these diagnostic procedures, homeowners can quickly identify and resolve common boiler errors, ensuring that their heating systems operate efficiently and effectively.
Resolving the E78 Water Pressure Sensor Error
If your Baxi boiler has displayed the E78 water pressure sensor fault, there are several steps you can take to resolve the issue. One potential issue to check for is a fan wiring fault, which can affect the boiler’s operation. This section will cover the most common corrective actions and replacements required to resolve the E78 fault.
Addressing Water Pressure Issues
The E78 fault is often caused by low system water pressure. Additionally, if the critical flow temperature reached due to insufficient circulation, it can also trigger the E78 fault. To address this issue, you should first check the water pressure gauge on your boiler. If the reading is below 1 bar, you will need to add water to the system via the filling loop until the pressure is between 1 and 1.5 bar. If the pressure is too high, you should bleed water from the radiators to reduce it to the correct level.
If the water pressure is within the correct range and the E78 fault persists, you may have a problem with the water pressure sensor or another component in the system.
Corrective Actions and Replacements
If you have addressed any water pressure issues and the E78 fault remains, you may need to take corrective actions or replace faulty components. Here are some of the most common solutions to the E78 fault:
Check the gas valve and fan wiring for faults or damage. If there is an issue with an external device unsuccessful connection, you may need to check the wiring and pairing.
Inspect the central heating thermistor sensor and negative temperature coefficient thermostat for any signs of damage or wear. If there is a fault in the printed circuit board (PCB), it may require replacement.
Check for a probable pump jammed. If the safety thermostat sensor tripped, it may indicate a jammed pump or air in the circuit.
Inspect the water pressure sensor for any signs of damage or wear. If the sensor is faulty, it will need to be replaced.
Check if the calibration function is incorrect. If the calibration function is incorrect, you may need to reset it.
If you suspect a defective gas air unit, you should contact a professional to inspect and replace the unit.
In conclusion, resolving the E78 water pressure sensor fault requires a thorough inspection of the system and the replacement of any faulty components. By following the steps outlined in this section, you can identify and address the root cause of the E78 fault and ensure your Baxi boiler operates safely and efficiently.
