BoilerFaultCodes
The most common Atag faults
Your boiler has too much water inside it, causing the pressure to rise to an unsafe level that has shut the system down.
Check that the filling loop valves are fully closed and not leaking water into the systemLocate a radiator bleed valve and use a key to drain a small amount of water into a containerMonitor the pressure gauge until it falls between 1.0 and 1.5 barPress the reset button to restart the boiler
Your boiler has detected that the water pressure inside the system is too low for it to operate safely.
Locate the filling loop, which is a silver braided hose with one or two valves connecting your cold water mains to your heating pipes.Slowly open the valve(s) to allow water into the system while watching the pressure gauge on the front of the boiler.Stop filling once the needle on the gauge reaches the green zone, typically between 1.0 and 1.5 bar, then tightly close the valves.
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 has stopped working because the water pressure inside the system has risen too high for it to operate safely.
Locate a radiator in your home with a bleed valve.Place a cloth or small container under the valve.Open the bleed valve slowly to release water until the pressure gauge on the front of the boiler drops to between 1.0 and 1.5 bar.Close the bleed valve tightly once the pressure has returned to the normal range.
Your boiler is struggling to circulate water, either because there isn't enough water inside the system or because the internal pump has stopped working.
Check your boiler's pressure gauge and ensure it is between 1.0 and 1.5 bar.If the pressure is low, use the filling loop to top up the system to the correct range.Check that your heating circulating valves are open and not blocked.
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
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.