BoilerFaultCodesThe 6 most common faults
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Check that your radiator valves are open to allow water to flow.Ensure the system pressure is between 1.0 and 1.5 bar on the pressure gauge.Press the Reset button on the control panel to see if the fault clears.
Your boiler has detected that water is not circulating correctly through the system, which prevents it from heating up safely.
Check that the boiler pressure gauge is between 1.0 and 1.5 barEnsure all radiator valves and isolation valves under the boiler are fully openBleed all radiators to remove trapped air bubbles from the pipeworkReset the boiler using the reset button once pressure is confirmed
Your boiler has temporarily stopped working because the water pressure inside the system has dropped too low.
Locate the filling loop or key underneath your boiler.Open the valves slowly to let mains water into the heating system.Watch the pressure gauge on the front of the boiler until the needle reaches between 1.0 and 1.5 bar, then close the valves tightly.
Your boiler has temporarily stopped working because the water pressure inside the system has dropped too low.
Locate the filling loop valves underneath your boiler.Open the valves gently to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the filling loop valves tightly and reset the boiler.
Your boiler is failing to light the gas, which means it cannot provide the heating or hot water you need.
Check that your gas supply is turned on and other gas appliances are working.If you have a prepay meter, ensure you have sufficient credit.Press the Reset button once to see if the boiler restarts.
Your boiler has lost track of the water pressure inside the system because the internal sensor is sending an incorrect signal or has failed.
Full guide for 102on the Atag i15R
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
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
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