BoilerFaultCodes
The most common Saunier Duval faults
Your boiler has detected a general issue and has entered a safety lockout mode.
Locate the On/Off switch on the boiler control panel.Turn the switch to the (0) position and wait for five seconds.Turn the switch back to the (I) position to attempt a system reset.
Your boiler has detected that the water pressure level inside the heating system has dropped below the required amount to operate safely.
Locate the filling loop, which is usually a silver braided hose with one or two small valves underneath the boiler.Slowly open the valves to allow mains water into the system until the pressure gauge needle reaches the green zone (typically 1.0 to 1.5 bar).Close the valves tightly to stop the flow of water and check the display to see if the flashing warning has cleared.
Your boiler is failing to light the flame, which is likely due to a lack of gas reaching the unit or a problem with the ignition system.
Check if other gas appliances, such as a hob, are working to confirm your gas supply is active.Verify that your gas meter has credit if you use a pre-payment meter.Check that the gas isolation valve under the boiler is in the 'on' or 'open' position (usually parallel to the pipe).Press the reset button on the boiler control panel.
Your boiler is failing to light the gas or cannot tell that the flame has successfully ignited, meaning it won't be able to provide heating or hot water.
Check if your home gas supply is active by testing another gas appliance like a hob.Inspect the condensate pipe (plastic pipe leadings outdoors) to ensure it isn't frozen or blocked.Try to reset the boiler by turning the main dial to the reset position for five seconds and then back to the heater symbol.
Your boiler has got too hot and has shut itself down as a safety precaution to prevent damage.
Turn the boiler off and allow it to cool down for 20 minutes.Check that your radiator valves are open and not turned to the off position.Check the boiler pressure gauge and top it up to 1.5 bar if it is too low.Press the reset button on the control panel to restart the unit.
Your boiler has shut down because a temperature sensor has detected that the water inside is getting too hot, likely due to a circulation problem.
Check that all radiator valves are fully open to allow water to flow.Check that the boiler pressure is between 1.0 and 1.5 bar on the gauge.Reset the boiler using the power switch to see if the fault clears.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Locate the filling loop (typically a silver braided hose with one or two valves underneath the boiler).Slowly open the valve(s) to allow cold mains water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the valve(s) tightly to stop the flow and ensure no water is leaking.
Your boiler has switched itself off because it has reached an unsafe temperature to protect the internal components from damage.
Check that all radiator valves are fully open to allow water to circulateEnsure the boiler pressure gauge is between 1 and 1.5 barPress the reset button once to see if the fault clears after the system has cooled down
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