BoilerFaultCodesThe 6 most common faults
Your boiler has tried to light several times without success and has now shut itself down for safety.
Check if other gas appliances, like a hob, are working to ensure gas is reaching the propertyCheck that your gas meter has credit and the emerald valve hasn't trippedPress the manual reset button on the boiler control panel once to attempt a restart
Your boiler is not receiving the signal from your thermostat or programmer to turn on, meaning it thinks it doesn't need to heat your home.
Check that your room thermostat is turned up higher than the current room temperature.Ensure your central heating programmer or timer is set to 'ON' or 'AUTO'.Check if any batteries in your wireless thermostat need replacing.
Your boiler has likely stopped working because it has exceeded a safe temperature limit and triggered a safety shut-down.
Locate the overheat reset button under the bottom casing of the boilerPress the reset button firmlyCheck that your radiator valves are open and that the pump is running
Your boiler has detected a temperature sensor fault, meaning it can no longer accurately monitor how hot the water is getting.
Full guide for Lights: On, Flash, OnYour boiler is not receiving enough electrical power to operate properly, likely due to a fault in your home's wiring or a power supply issue.
Full guide for Lights: Flash, Off, FlashYour boiler has detected that it is heating up internally without enough water flowing through it, causing it to shut down to prevent damage.
Full guide for Lights: On, Flash, Flashon the Baxi Solo 2
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