Main boilers are known for their affordability and reliability, but like any boiler, they can occasionally display error codes when an issue arises. These codes are designed to help you identify and address problems quickly, ensuring your home remains warm and comfortable.
In this post, we’ll explore some of the most common Main boiler error codes, what they mean, and how to resolve them.
If your system is showing a fault code or has stopped working, professional Main boiler repairs in East London can quickly diagnose the issue and restore safe operation.
E119 – Low Water Pressure
Meaning: The boiler’s water pressure has dropped below the safe operating level.
Common Causes:
- Leaks in the system.
- Recently bled radiators.
- A faulty pressure sensor.
Solution:
- Check the pressure gauge; it should be between 1 and 1.5 bar.
- Re-pressurise the boiler using the filling loop. Consult the user manual for specific instructions.
- If the issue persists, contact a professional engineer to inspect the system for leaks.
E133 – Ignition Fault
Meaning: The boiler is unable to ignite.
Common Causes:
- Gas supply issues.
- Faulty ignition electrode.
- Blocked burner or flue.
Solution:
- Ensure your gas supply is on and check other gas appliances.
- Reset the boiler and try to ignite it again.
- If the problem persists, contact a Gas Safe registered engineer to inspect the ignition system and flue.
E168 – Miscellaneous Fault
Meaning: This code indicates an undefined fault, often related to software or component issues.
Common Causes:
- Temporary glitches.
- Sensor or wiring faults.
Solution:
- Reset the boiler and observe if the issue reoccurs.
- If the error persists, a professional engineer should diagnose the issue.
E125 – Overheating Fault
Meaning: The boiler has detected a high temperature that exceeds safe levels.
Common Causes:
- Blockages in the heating system.
- A faulty pump or thermostat.
- Airlocks in the radiators.
Solution:
- Check and bleed the radiators to remove airlocks.
- Inspect the pump for proper operation.
- Contact an engineer to clean the system or replace defective components.
E160 – Fan Fault
Meaning: The fan, which ensures safe removal of exhaust gases, is not functioning properly.
Common Causes:
- Faulty or jammed fan.
- Blocked flue.
- Electrical connection issues.
Solution:
- Inspect the flue for blockages and clear any debris.
- Contact a qualified engineer to repair or replace the fan.
E20 – Central Heating Thermistor Fault
Meaning: The central heating thermistor (temperature sensor) has detected an issue.
Common Causes:
- Faulty thermistor.
- Wiring issues.
Solution:
- Reset the boiler and see if the error clears.
- If the problem persists, replace the thermistor with the help of a professional.
E28 – Flue Sensor Fault
Meaning: The flue sensor is malfunctioning, which can affect the safe operation of the boiler.
Common Causes:
- Dirty or damaged flue sensor.
- Wiring problems.
Solution:
- Clean or replace the flue sensor.
- Ensure all connections are secure. Contact a qualified engineer if needed.
Tips for Managing Main Boiler Error Codes
- Refer to the Manual: Always consult your boiler’s user manual for detailed information about error codes and troubleshooting.
- Perform Regular Maintenance: Annual servicing by a certified engineer can help prevent common errors and ensure your boiler operates efficiently.
- Avoid DIY Repairs: For anything beyond simple tasks like re-pressurising, always contact a professional to avoid safety risks or further damage.
- Work with a Trusted Provider: Triple A Heating specialise in servicing and repairing Main boilers, offering expert advice and reliable solutions.
Some fault codes indicate emergency boiler faults that require immediate professional attention to avoid further damage or safety risks. The Gas Safe Register advises that boiler fault investigation and repairs must only be carried out by registered engineers to ensure safety and legal compliance.
When to Call a Professional
Boiler error codes can be concerning, especially when heating or hot water is affected. Our engineers can diagnose Main boiler faults accurately and carry out safe, professional repairs to get your system back up and running.
Accurate fault diagnosis should always be carried out by qualified heating engineers with experience working on Main boiler systems.