BoilerFaultCodesThe 6 most common faults
Your boiler has become too hot and has shut down as a safety precaution to prevent damage.
Check that all radiator valves are fully openBleed your radiators to remove trapped air using a radiator keyWait for the boiler to cool down and press the reset button
Your boiler has likely overheated because water isn't moving through the system properly, causing the unit to shut down for safety.
Check that your radiator valves and isolation valves are fully openBleed your radiators to remove trapped air from the systemGently press the reset button on the front of the boiler panel
Your boiler has become too hot and has automatically shut down to protect itself.
Locate the reset button on the front control panel.Press and hold the reset button for at least 5 seconds.Ensure your radiator valves are open and your system pressure is adequate if a gauge is visible.
Your boiler has detected that water isn't moving through the system properly or there isn't enough water inside, causing it to overheat quickly.
Check if your system pressure gauge is too low and top it up if neededEnsure all radiator valves and boiler isolation valves are fully openGently bleed your radiators to remove any trapped air pockets
Your boiler has sensed that it is getting too hot or that water isn't moving through the system properly, causing it to shut down for safety.
Check that all radiator valves are fully openEnsure your system water pressure is between 1 and 1.5 barPress the reset button firmly for 5 seconds
Your boiler has become too hot and has automatically shut down for safety.
Wait for the boiler to cool down for at least 20 minutesPress the 'Reset' button on the control panelCheck that your radiator valves are open and that your pump is running
on the Baxi 100/2 HE Plus
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