When your boiler displays an error code, it can be both confusing and concerning, especially during colder months. Our heating engineers in Beaconsfield frequently receive calls from worried homeowners unsure about what these mysterious codes mean. While some codes indicate minor issues you might resolve yourself, others signal the need for professional attention. Here’s our comprehensive guide to understanding common boiler error codes.
Worcester Bosch Error Codes
Worcester Bosch boilers are among the most reliable on the market, but they’re not immune to problems. These systems use specific error codes beginning with letters like ‘EA’ or ‘H’ followed by numbers.
EA Error: This typically indicates an issue with the flue or flue sensor. If you see this code, check that nothing is blocking your flue outlet outside. In Buckinghamshire’s leafy areas, it’s not uncommon for debris to cause this error, especially during autumn.
H26 or H27: These codes often point to a water flow problem. Low boiler pressure is the usual culprit, which you can remedy by repressurisng your system following the manufacturer’s instructions.
E9: This signals an overheating issue. While it sometimes resolves with a simple reset, persistent E9 codes may indicate a blockage in your heating system that requires a power flush by a qualified engineer.
Vaillant Error Codes
Vaillant boilers display ‘F’ followed by numbers to indicate specific faults.
F.22: This indicates low water pressure in your system. You can typically fix this yourself by repressurising your boiler using the filling loop.
F.28 or F.29: These codes suggest ignition failure. While this could stem from various issues, gas supply problems or faulty ignition components are common culprits. After checking your gas supply is active, you’ll likely need professional assistance.
F.75: This indicates a water pressure sensor fault or pump issue. Unfortunately, this typically requires an engineer’s attention as it involves internal components.
Ideal Boiler Error Codes
Ideal boilers display numerical codes for different faults.
Code 1: Indicates low water pressure, which is among the most common boiler issues we see. Like other boilers, you can resolve this by carefully following the manufacturer’s repressurising instructions.
Code 5: Suggests ignition lockout, often caused by gas supply issues. Check your gas meter is active, and try a reset. If the problem persists, you’ll need professional help.
Code 6: Signals a flame loss issue. This might happen due to draught conditions or internal component faults. While a reset sometimes resolves it, recurring Code 6 errors warrant professional inspection.
What to Do When You See an Error Code
- Record the code: Note down exactly what’s displayed on your screen.
- Check your manual: Most manufacturers provide troubleshooting steps for common codes.
- Try a reset: Many minor issues resolve with a simple boiler reset.
- Check basic factors: Ensure your gas supply is active, pressure is correct, and external flues aren’t blocked.
- Don’t attempt internal repairs: Boiler repairs often involve gas components, which legally require Gas Safe registered engineers.
For persistent or concerning errors, particularly those involving unusual boiler noises or water leaks, it’s always safest to contact a professional.
When to Call a Professional
While some codes indicate minor issues you can address yourself, others warrant immediate professional attention:
- Any gas-related errors
- Persistent recurring codes despite resets
- Codes accompanied by unusual noises, smells, or leaks
- Any code that doesn’t appear in your manual
With over 20 years of experience addressing boiler issues across Buckinghamshire, we’ve seen and fixed virtually every error code scenario. Our Gas Safe registered engineers carry parts for all major boiler brands and can typically diagnose and resolve issues in a single visit.
Need Help With a Boiler Error?
If your boiler is displaying an error code you’re unsure about, or you’d like to schedule a preventative annual boiler service to avoid future issues, our Beaconsfield heating engineers are here to help. Contact Chiltern Boilers today for prompt, professional assistance with all your heating needs.