BoilerFaultCodesThe 6 most common faults
Your boiler has lost the water pressure required to circulate heat around your home, likely due to a small leak somewhere in your radiator system.
Locate the external filling loop, which is a silver braided hose connecting your central heating pipes.Open the valves at both ends of the filling loop to allow cold mains water into the system.Watch the pressure gauge on the boiler front until the needle reaches the green zone (typically 1.0 to 1.5 bar).Close both valves firmly and check that the pressure remains steady.
Your boiler has switched itself off because it got too hot or experienced a power cut, and it simply needs to be manually reset to start working again.
Locate the overheat reset button on the bottom of the boiler control boxPress the reset button firmlyWait for the boiler to restart and check if the light has gone out
Your boiler has become too hot and has automatically shut itself down to prevent damage or safety issues.
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'
Your boiler has switched itself off because it has reached a temperature that is too high, and it needs to be manually reset once it has cooled down.
Wait for the boiler to cool down completelyLocate the reset button on the control box under the boilerPress the reset button and check if the neon light goes out and the boiler restarts
Your boiler has become too hot and has automatically shut down as a safety precaution to prevent damage.
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.
Your boiler has stopped working because it has detected a temperature that is too high and has temporarily disabled itself for safety.
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.
on the Baxi Solo 3 PFL
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