BoilerFaultCodesThe 6 most common faults
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 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 shut down because there is too much water pressure in the system, which needs to be lowered to a safe level.
Locate a radiator bleed valve and use a radiator key to carefully release a small amount of water into a container.Monitor the pressure gauge on the boiler until it drops back into the green zone, typically between 1.0 and 1.5 bar.Check that the filling loop valves are fully closed to prevent more water from entering the system.
Your boiler has detected that the water pressure is either too low or too high to operate safely, or the sensor that monitors this pressure has lost its connection.
Check the pressure gauge on the front of the boiler or via the display menu.If the pressure is below 1.0 bar, use the filling loop valves to top it up to roughly 1.5 bar.If the pressure is too high (above 3.0 bar), bleed a radiator to release some water and lower the pressure.Restart the boiler to see if the code clears.
Your boiler is struggling to pump water around your heating system correctly and has shut down to prevent itself from overheating.
Full guide for c1 54on the Atag A200
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