BoilerFaultCodesThe 6 most common faults
Your boiler has detected that it is getting too hot or that water is not moving through the system correctly, causing it to shut down for safety.
Check that your system pressure is between 1 and 1.5 bar on the pressure gauge.Ensure all radiator valves and any isolation valves are fully open.Press the reset button on the control panel to see if the fault clears.
Your boiler has switched itself off because it got too hot, which is a safety measure to prevent damage to the system.
Wait for the boiler to cool down completely (at least 20-30 minutes).Ensure all radiator valves are open and there are no obstructions to water flow.Locate the manual reset button (typically under a small black cap on the control panel) and press it firmly.
Your boiler has tried to light several times but cannot start, usually because of an empty fuel tank or a blocked oil line.
Check your oil tank to ensure you haven't run out of fuel.Verify that the oil supply valve on your tank is fully open.Press the 'Reset' button on the burner control box once.
Your boiler's internal safety system has detected that the fan, which clears exhaust gases, is not spinning correctly or has lost power.
Full guide for 4 red flashesYour boiler's internal memory chip has developed a communication fault, meaning the control system can no longer read the settings it needs to operate safely.
Full guide for 5 red flashesYour boiler has detected an internal communication error or a generic failure that is preventing it from running safely.
Full guide for 6 red flasheson the Baxi Statesman
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