BoilerFaultCodesThe 6 most common faults
Your boiler has shut down because it is too hot, likely due to low water pressure or a circulation issue within your radiators.
Check your pressure gauge; if it is below 1.0 bar, use the filling loop to increase pressureBleed all radiators in the house to release any trapped airTop the system back up to 1.0-1.5 bar and press the reset button on your boiler
Your boiler has stopped working because the amount of water inside your heating system has dropped below the required level.
Locate the filling loop, which is usually a flexible silver hose with one or two small valves connecting your cold water supply to the heating pipework.Open the valve(s) slowly to allow water into the system while watching the pressure gauge on the front of the boiler.Close the valve(s) firmly once the needle on the gauge reaches 1 bar, then check the boiler restarts.
Your boiler has stopped working because the amount of water inside your heating system has dropped below the required level.
Locate the filling loop (a silver flexible hose) underneath the boiler or near your airing cupboardOpen the valves on both ends of the loop to allow water into the systemWatch the pressure gauge on the front of the boiler until the needle reaches the green zone (typically 1.0 to 1.5 bar)Close both valves tightly and ensure the loop is disconnected if it is a removable type
Your boiler is failing to light the gas flame despite several attempts, meaning you currently have no heating or hot water.
Check that your gas supply is turned on at the meterIf you have a pre-payment meter, ensure you have credit remainingIf it is freezing outside, check that your white condensate pipe is not frozen or blockedPress the 'Reset' button on the front panel to restart the ignition sequence
Your boiler has switched itself off because it has reached an unsafe temperature and needs to cool down.
Check that your radiator valves are open and not turned to zero.Ensure there is enough water pressure in the system (typically 1.0 to 1.5 bar).Press the 'Reset' button on the front of the boiler to see if the code clears.
Your boiler has lost water pressure, causing it to shut down to prevent damage to the internal components.
Locate the pressure gauge on the front of the boiler or underneath it.Find the filling loop (usually a silver flexible hose with two small valves).Slowly open both valves to let water into the system until the gauge reaches 1.5 bar, then close them tightly.The boiler should restart automatically or may require a reset.
on the Ideal Icos System
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 Ideal 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