BoilerFaultCodes
The most common Heatline faults
Your boiler has switched itself off because it has reached an unsafe temperature and needs to cool down before it can be restarted.
Check that all radiator valves are fully openEnsure the boiler pressure is between 1 and 1.5 bar on the gaugePress the reset button once the boiler has cooled down for 20 minutes
Your boiler has switched itself off because the water level inside the heating system has dropped too low to operate safely.
Locate the external filling loop, which is usually a silver braided hose under the boiler.Open the small valve or tap attached to the loop slowly, allowing water to enter the system while watching the pressure gauge.Stop filling once the needle reaches the green zone, typically between 1.0 and 1.5 bar, then ensure the valve is fully closed.
Your boiler has switched itself off because the water inside it has become too hot, usually due to a lack of circulation or a blockage.
Check that your radiator valves are fully open to allow water to flow.Check the boiler pressure gauge and top up to 1.5 bar if it is too low.Reset the boiler using the control knob to see if the fault clears.
Your boiler has shut down to protect itself, likely because it got too hot or failed to light the gas flame.
Turn the main control knob to the 'Off' position.Wait for at least 15 seconds for the system to reset.Turn the control knob back to the 'On' or 'Winter' position and check if the flame ignites.
Your boiler has detected that there is not enough water in the system to operate safely and has shut down as a precaution.
Locate the filling loop (the flexible silver hose) underneath the boiler.Slowly open the one or two taps on the filling loop until you hear water entering.Monitor the pressure gauge and close the taps once the needle reaches between 1.0 and 1.5 bar.
Your boiler has tried to light itself three times but failed, meaning your heating and hot water have stopped working.
Check if your gas meter has credit and the isolation valve is open.Ensure other gas appliances in your home, like a hob, are working correctly.Press the Reset button on the boiler control panel to clear the lockout.
Your boiler has failed to light, which means your heating and hot water will not work until the gas supply is restored or a internal ignition fault is fixed.
Check that your gas meter has credit (if using a prepay meter).Ensure the gas emergency control valve is in the 'on' position.Try resetting the boiler by turning the control knob to 'Reset' for 5 seconds.Check if other gas appliances, like a cooker, are working to confirm your gas supply is active.
Your boiler has stopped working because water is not circulating correctly through the pipes, likely due to a faulty pump or an air bubble.
Check that all radiator valves and boiler isolation valves are fully openBleed your radiators to release any trapped air from the systemPress the Reset button on the front of the boiler to see if the code clears
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.