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Worcester Bosch Boiler Fault Codes
Clear reasons to common Worcester Bosch boiler fault codes.
Understand your Worcester Bosch boiler fault codes and how to fix them.
Find helpful and reliable reasons behind you Worcester Bosch boiler fault codes and how to fix them.
Worcester Bosch Boiler Fault Codes
Quick reference for Worcester Bosch boiler fault codes and what they mean
If your Worcester Bosch boiler shows an error message, it will usually display a code to help identify the issue. These Worcester Bosch boiler fault codes are designed to highlight common problems such as low pressure, ignition failures, or sensor errors. By understanding what these codes mean, you can decide whether a simple reset will fix the problem or if it’s time to call a Gas Safe engineer for professional support.
Top Worcester Bosch Boiler Fault Codes
Find the right Worcester Bosch boiler fault codes for your model
Different Worcester Bosch boiler models display fault codes in slightly different ways. Below, we’ve listed some of the most popular models along with their most common fault codes. This guide will help you quickly identify issues so you know the next steps to take.
Worcester Bosch Greenstar 2000 Fault Codes
- EA 227 – Ignition failure
Check that your gas supply is on and the boiler has been reset. If the fault continues, an engineer should inspect the ignition system. - E9 – Overheating fault
This usually means poor circulation. Try bleeding radiators and checking system pressure. If unresolved, the pump or sensors may need professional attention. - A1 – Pump stuck or running dry
Ensure the boiler pressure is correct. If the pump is seized, it will require an engineer to free or replace it. - CE 207 – Sensor fault
One of the temperature sensors may be faulty. Reset the boiler, but if the code remains, a replacement sensor is likely needed.
Worcester Bosch Greenstar 2000 Lifestyle Fault Codes
- EA 229 – No ignition detected
Reset the boiler and ensure gas supply. If the problem continues, the ignition electrode or gas valve may need servicing - CE 201 – Flow temperature sensor
Sensor wiring or the sensor itself may be faulty. Professional replacement is advised. - H07 – Low water pressure
Re-pressurise the system to around 1.5 bar and check for leaks if pressure drops again. - A5 – Fan fault
The fan may not be running correctly. Requires a Gas Safe engineer to inspect and repair.
Worcester Bosch Greenstar 4000 Fault Codes
- EA 229 – No ignition detected
Check gas supply, meter, and reset the boiler. If it fails repeatedly, the ignition system or gas valve may need service. - CE 201 – Flow temperature sensor error
Often caused by wiring issues or a faulty sensor. A qualified engineer will need to test and replace if needed. - H07 – Low system water pressure
Check the pressure gauge and re-pressurise to around 1.5 bar if low. Keep an eye out for leaks. - A5 – Fan fault
This indicates a fan speed or connection issue. Do not attempt to repair yourself – call an engineer.
Worcester Bosch Greenstar 8000 Life Fault Codes
- EA 227 / EA 229 – Ignition problems
Check the gas supply and reset. If it persists, it may be an ignition electrode or gas valve fault. - E9 – Overheating fault
Check system pressure and radiators. If the problem continues, the circulation pump may need replacement. - C6 – Fan speed error
The fan is not operating as expected. This needs professional testing and repair. - A61 – Gas valve fault
Do not attempt to fix this yourself. A Gas Safe engineer will need to replace or repair the valve.
Worcester Bosch Greenstar 8000 Style Fault Codes
- EA 234 – Flame not detected
Check gas supply and reset. If it does not relight, call an engineer to check the ignition system. - CE 203 – Flow sensor fault
This sensor may need replacement. A professional diagnosis is required. - H07 – Water pressure too low
Top up the boiler via the filling loop until the gauge reads 1.5 bar. If pressure keeps dropping, there may be a leak. - A5 – Fan or air pressure issue
Requires an engineer, as the fan or pressure switch may be faulty.
Worcester Bosch Greenstar 8000 Compact Fault Codes
- EA 234 – Flame not detected
Check the gas supply and reset. If unsuccessful, the flame sensor or ignition system could be at fault. - E9 – Overheating
Confirm system pressure and bleed radiators. Persistent issues may indicate a circulation pump or heat exchanger problem. - C6 – Fan speed error
The fan is not performing correctly. Professional diagnosis and repair are required. - A61 – Gas valve error
Do not attempt to fix yourself; call a qualified Gas Safe engineer.
Worcester Bosch CDI Compact Fault Codes
- EA 227 – No flame detected
Check gas supply and reset the boiler. If unsuccessful, the ignition or flame sensor could be faulty. - E9 – Overheating fault
Bleed radiators and check pressure. If it continues, pump or heat exchanger faults are possible. - A61 – Gas valve error
This must be checked and repaired by a Gas Safe registered engineer. - C6 – Fan not reaching correct speed
The fan or control board may be at fault – professional repair is needed.
Worcester Bosch Greenstar Junior Fault Codes
- EA 227 – Ignition failure
Ensure gas supply is on and the boiler has been reset. Persistent issues usually require an engineer to inspect the ignition components. - E9 – Overheating
Check system pressure and bleed radiators if necessary. If overheating continues, the circulation pump may need attention. - A1 – Pump fault
Indicates the pump may be blocked or stuck. Check pressure; call a qualified engineer if it persists. - CE 207 – Sensor error
Often caused by a faulty temperature sensor. reset the boiler, but replacement may be required.
Worcester Bosch Greenstar 30i / 50i Fault Codes
- EA 227 / EA 229 – Ignition problems
Check gas supply and reset the boiler. Recurrent issues usually indicate ignition components need servicing. - E9 – Overheating
Check system water pressure and bleed radiators. If overheating continues, the pump or heat exchanger could be at fault. - H07 – Low pressure
Top up the system to 1.5 bar. Continuous drops may indicate leaks or faulty components. - C6 – Fan error
The fan or control system may be at fault; call an engineer.