Modern boilers display an error or fault code when they detect a problem. The code flags which area or component has triggered a safety lockout or warning. Some codes clear with a single reset and do not return. If a code keeps coming back, there is an underlying fault that needs diagnosing by an engineer.
This page covers the most common fault codes for the makes we see regularly across Burnley and East Lancashire. Call us on 07939 236001 if you are not sure what yours means.
On many Baxi boilers, E1 is not usually the full fault code. Baxi fault codes often start with E1, followed by another number, such as E118, E119, E110 or E133.
If your boiler is showing an E1 fault, check the full code on the display before calling an engineer, as the number after E1 helps identify the problem.
Baxi fault codes E118 and E119 usually mean the boiler has low water pressure.
This can happen if the pressure in the heating system has dropped below the required level. The boiler may stop working until the pressure is restored.
Baxi fault code E110 means the overheat thermostat has been triggered.
This usually means the boiler has detected that it is getting too hot and has shut down as a safety precaution.
Baxi fault code E133 means there has been an ignition failure.
This means the boiler has tried to light but has been unable to ignite successfully.
Baxi fault code E160 usually indicates a fan fault.
The fan is an important safety component that helps remove waste gases from the boiler. If there is a fan fault, the boiler may lock out.
Baxi fault code E160 usually indicates a fan fault.
The fan is an important safety component that helps remove waste gases from the boiler. If there is a fan fault, the boiler may lock out.
Baxi fault code E125 usually means there is a circulation fault.
This can happen when water is not circulating properly through the boiler or central heating system.
Baxi fault code H.02.07 usually means the boiler has low water pressure.
The system pressure may need to be checked and topped up if it is below the recommended level.
Worcester fault code EA 227 means no flame has been detected.
This usually means the boiler has tried to ignite but has not detected a flame.
Worcester fault code EA 229 means there has been a loss of flame during operation.
The boiler may have lit successfully but then lost the flame while running.
Worcester fault code F7 228 means ionisation has been detected before ignition.
This indicates the boiler is detecting a flame signal when it should not be.
Worcester fault code C6 usually indicates a fan fault.
The fan helps the boiler operate safely, so this type of fault should be inspected by a qualified engineer.
Ideal fault code L1 means the boiler has detected an overheat fault.
The boiler may have shut down to protect itself and the heating system.
Ideal fault code L2 means ignition lockout.
This means the boiler has failed to ignite and has locked out for safety.
Ideal fault code F1 means low water pressure.
The boiler may stop working until the system pressure is brought back to the correct level.
Ideal fault code F2 means flame loss.
The boiler may have lit initially but then lost the flame during operation.
Vokera fault code A01 means ignition failure.
The boiler has tried to light but has been unable to ignite successfully.
Vokera fault code A02 usually means a limit thermostat fault.
This can happen if the boiler has overheated or detected an unsafe temperature.
Vokera fault code A03 usually indicates a fan fault.
The boiler may lock out if the fan is not working correctly.
Vokera fault code A04 means insufficient system water pressure.
The heating system pressure may be too low for the boiler to operate safely.
Vaillant fault code F75 means the boiler has detected no pressure rise from the pump.
This can be caused by an issue with the pump, pressure sensor, or system pressure.
Vaillant fault code F28 means failed ignition.
The boiler has attempted to ignite but has not been able to light successfully.
Vaillant fault code F29 means the flame has gone out during operation.
This means the boiler did initially light, but the flame was lost while the boiler was running.
Vaillant fault code F22 usually means a dry fire or low water pressure fault.
This often happens when there is not enough water pressure in the heating system for the boiler to operate safely.
Vaillant fault code F62 usually relates to a gas valve shutoff delay.
This fault should be checked by a qualified Gas Safe registered engineer.
Do not continue using the boiler with a suspected flue fault. Carbon monoxide can back-draft into the property. Call an engineer.
Flame failure across several brands. One reset worth trying. If it returns, book a call-out.
The boiler locked out after failing to light, typically after three attempts. A reset will sometimes clear a one-off lockout. If it does not, or keeps coming back, it needs diagnosing.
If your boiler is showing a fault code, keeps locking out, or the same error keeps coming back after a reset, it’s time to get it checked properly. David can diagnose the issue, explain what’s causing the fault, and advise on the safest, most cost-effective repair.
Don’t keep resetting a boiler that is repeatedly showing an error. Book a local Gas Safe engineer and get the problem sorted safely.
Book your boiler fault diagnosis today
