BoilerFaultCodesThe 6 most common faults
Your boiler has sensed that it is getting too hot too quickly or that water isn't moving through the system properly.
Check that your radiator valves are openEnsure the system pressure is between 1 and 1.5 barReset the boiler by turning the selector switch to 'R' for five seconds
Your boiler has become too hot and has automatically shut itself down as a safety precaution.
Ensure all radiator valves are fully open to allow water to circulateCheck that your system pressure is between 1 and 1.5 bar on the gaugeAllow the boiler to cool down, then move the selector switch to 'R' to reset
Your boiler has tried to light itself several times without success, so it has shut down as a safety precaution.
Check that your gas supply is turned on at the meterIf you have a prepaid meter, ensure you have sufficient creditTurn the selector switch to the reset position for five seconds, then back to the on position
Your boiler has encountered a general electrical or communication error and needs to be reset to try and clear the fault.
Locate the selector switch on the front of the boiler.Turn the switch to the 'Reset' position and hold it for five seconds.Return the switch to the original 'On' position and wait to see if the green light remains steady.
Your boiler's internal fan is not spinning correctly, which means the system cannot safely clear waste gases and will not ignite.
Full guide for 4 red flashesYour boiler's internal memory chip has developed a communication fault or become corrupted, preventing the system from starting up.
Full guide for 5 red flasheson the Baxi EP
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