BoilerFaultCodesThe 6 most common faults
Your boiler has stopped working because the water pressure is critically low and needs to be topped up.
Locate the filling loop (the flexible silver hose) underneath or near the boilerSlowly open the small valve handle(s) until you hear water flowingWatch the pressure gauge until it reaches between 1.0 and 1.5 bar, then turn the valves off tightly
Your boiler's internal computer brain has temporarily lost its ability to talk to the control sensors and requires a manual power restart.
Locate the main electrical power switch for your boiler (usually a fused spur switch nearby).Turn the power switch to the 'Off' position and wait for 30 seconds.Turn the power switch back to 'On' to allow the system to reboot and re-establish communication.
Your boiler has detected that water is not circulating properly, which could mean the pump has stopped working or the water pressure is too low.
Check the pressure gauge on your boiler or under the sink.If the pressure is below 1.0 bar, use the filling loop to top it up to 1.5 bar.Reset the boiler to see if the error clears.
Your boiler has switched itself off because it has become too hot internally, often due to a lack of water flow or a blockage.
Check that your system pressure is between 1.0 and 1.5 bar on the pressure gaugeEnsure all radiator valves are fully open to allow water to circulatePress the 'Reset' button on the boiler control panel after the unit has cooled down
Your boiler has sensed that the water inside has become far too hot and has shut down as a safety precaution.
Check that all radiator valves are fully open to allow water to circulateEnsure your system water pressure is between 1.0 and 1.5 bar on the gaugeReset the boiler by pressing the reset button to see if the fault clears
Your boiler has tried to light several times but has failed to produce a flame, meaning your heating and hot water will not work.
Check if other gas appliances, like a cooker, are working to ensure gas supplyCheck if your gas meter has creditPress the Reset button once to see if the boiler restarts
on the Atag Sov.
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 Atag 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