BoilerFaultCodesThe 6 most common faults
Your boiler pressure is currently too low, which means it doesn't have enough water inside to circulate heat around your home.
Locate the external filling loop, usually two silver flexible hoses with valves attached under the boiler.Open the valves slowly to allow mains cold water into the system while watching the pressure gauge.Close the valves firmly once the needle sits in the green zone between 1 and 1.5 bar.
Your boiler has detected that it is firing up without enough water inside, which can lead to overheating and potential damage.
Check the pressure gauge on the boiler or under the sink; it should be between 1.0 and 1.5 bar.If the pressure is too low, use the filling loop to top up the system with water.Ensure all radiator valves and isolation valves under the boiler are fully open.Reset the boiler to see if the fault clears.
Your boiler has tried to light several times but failed, so it has locked itself for safety.
Check that your gas meter is turned on and you have credit.Check if other gas appliances, like a cooker, are working.Turn the selector switch to 'Reset' for 5 seconds, then back to your original setting.
Your boiler has switched itself off because it has become too hot internally, usually due to a lack of water flow or a circulation error.
Check that your radiator valves are open to allow water to flow.Check the boiler pressure gauge and top it up to 1.5 bar if it is too low.Allow the boiler to cool down for 20 minutes and then press the reset button.
Your boiler has detected there is not enough water flowing through it to safely heat up, which has caused it to shut down to prevent overheating.
Check the pressure gauge on the front of the boiler or under the sinkIf the pressure is below 1.0 bar, use the filling loop to top it up to 1.5 barEnsure all radiator valves are open and turn the selector switch to reset
Your boiler has switched itself off because it has become too hot to operate safely and requires a manual reset once it has cooled down.
Ensure all radiator valves are fully open to allow water to flow.Wait for the boiler to cool down for at least 30 minutes.Turn the selector switch to the 'Reset' position and hold for 5 seconds before turning it back to 'On'.
on the Baxi 130 HE (range)
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