BoilerFaultCodesThe 6 most common faults
01
Overheat High DIY-safe
Your boiler has become too hot and has automatically shut itself down to prevent damage or safety issues.
What to try first
Check that your radiator valves are open to allow water to circulateLet the boiler cool down for 15 to 30 minutesPress the reset button or turn the control knob to the 'Off' position and then back to 'On'
02
Overheat light High DIY-safe
Your boiler has become too hot and has automatically shut down as a safety precaution to prevent damage.
What to try first
Locate the thermostat control knob on the boiler front panel.Turn the knob fully anticlockwise to the 'OFF' position.Wait 10 seconds, then turn the knob back to your desired temperature setting to reset the light.
03
Lockout High DIY-safe
Your boiler has stopped working because it has detected a temperature that is too high and has temporarily disabled itself for safety.
What to try first
Turn the boiler control knob to the 'OFF' position.Wait for at least 10 seconds to allow the system to reset.Turn the control knob back to your desired setting.
04
lockout light High Engineer
Your boiler has detected a safety issue and stopped working to protect your home, meaning you currently have no heating or hot water.
Full guide for lockout light05
E26 High Engineer
Your boiler has detected an issue with the internal air flow system, which prevents it from safely lighting the burner.
Full guide for E2606
E02 High Engineer
Your boiler has detected that the internal mechanism responsible for moving water around your heating system is not working correctly, which will stop your radiators and hot water from warming up.
Full guide for E02on the Baxi Solo 3 PFL System
Circulation pumpOverheat thermostatFlow temperature sensorOverheat ThermostatCirculation PumpHeat Exchanger (de-scaling)
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Baxi shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue