BoilerFaultCodesThe 6 most common faults
Your boiler is struggling to move water around the system properly before it starts the ignition process.
Check that your central heating valves under the boiler are fully openEnsure all radiator valves (TRVs) are turned to the highest settingCheck the boiler pressure gauge is between 1 and 1.5 bar; top up if it is too lowRestart the boiler using the reset button
Your boiler has stopped working because the water pressure is either too low or the system has become too hot.
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If it is low, use the filling loop underneath the boiler to top up the water pressure.Press the 'R' or Reset button once the pressure is restored to restart the boiler.
Your boiler has got too hot or is struggling to maintain a steady flame, causing it to shut down for safety.
Check that your gas pre-pay meter has credit and the emerald lever is openEnsure all radiator valves are fully open to allow water to circulateLet the boiler cool down for 30 minutes, then press and hold the 'R' or Reset button for 5 seconds
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Locate the filling loop (usually a silver braided hose with small black lever valves under the boiler).Slowly open the valves until you hear water flowing and the pressure gauge needle moves between 1.0 and 1.5 bar.Close both valves tightly and press the 'Reset' button on the boiler control panel.
Your boiler has detected that water isn't moving through the system properly, which is causing it to stop to prevent overheating.
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 bar on the gaugeBleed all radiators to remove trapped air from the system
Your boiler has detected that the flame has gone out while it was running, which could be caused by an issue with the gas supply or a faulty internal fan.
Check that your gas emergency control valve is open and other gas appliances are workingCheck if your condensate pipe has frozen if it is cold outsidePress the Reset button for five seconds
on the Baxi Assure
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
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
Affiliate links. We may earn a commission at no extra cost to you.