BoilerFaultCodes
The most common Atag faults
Your boiler has detected that the water pressure in your heating system is too high and has shut itself down to prevent damage.
Locate a radiator in your home, preferably one upstairs.Use a radiator bleed key to slowly open the bleed valve over a cloth.Release a small amount of water until the pressure gauge on the front of the boiler drops to between 1.0 and 1.5 bar.Tighten the bleed valve and check the boiler display.
Your boiler's internal computer has encountered a software or hardware conflict and has stopped working as a safety precaution.
Locate the 'Reset' button on the boiler control panelPress and hold the button for 2-3 secondsWait to see if the error clears and the boiler restarts
Your boiler has shut down because the water inside the unit has reached a temperature that is too hot to operate safely.
Check that all radiator valves (TRVs) are turned to the highest settingEnsure the boiler pressure is between 1.0 and 1.5 barWait 30 minutes for the unit to cool down and then press the Reset button
Your boiler has lost water pressure and has shut itself down to prevent damage to the internal components.
Locate the filling loop (usually a silver braided hose with two black handles underneath the boiler).Slowly open both handles until you hear water entering the system.Watch the pressure gauge and close both handles once the needle reaches 1.5 bar.
Your boiler has stopped working because the water pressure inside the system has risen too high, likely due to a faulty filling loop or a system issue.
Locate the radiator bleed valves throughout your home.Place a cloth under a valve and use a radiator key to slowly release some water until the pressure gauge on the boiler drops to between 1.0 and 1.5 bar.Check the boiler control panel to see if the error has cleared.
Your boiler has sensed that water isn't moving through the system properly and has shut down to prevent the unit from overheating.
Check that your system pressure is between 1.0 and 1.5 bar on the pressure gauge.Ensure all radiator valves and external isolation valves are fully open.Listen for air trapped in the pump or radiators and bleed them if necessary.Reset the boiler to see if the error clears once water flow is restored.
Your boiler has detected that the water pressure inside your heating system is either too low or too high for it to operate safely.
Check your pressure gauge, which should ideally read between 1.0 and 1.5 bar.If the pressure is below 1.0 bar, locate the filling loop under the boiler.Slowly open the valve to let water in until the pressure reaches 1.5 bar, then tightly close it.If the pressure was above 2.5 bar, you may need to bleed a radiator to release excess pressure.
Your boiler has switched itself off because it detected that the internal water temperature has become dangerously hot or a sensor has failed.
Ensure all radiator valves are fully open to allow water to flow.Check that your boiler pressure is between 1 and 1.5 bar on the pressure gauge.Turn the boiler off and back on again once it has had 30 minutes to cool down.
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