BoilerFaultCodesThe 6 most common faults
Your boiler has switched itself off because it has reached an unsafe temperature and needs to cool down before it can be used again.
Wait 20 minutes for the boiler to cool down.Check that your radiator valves are open and not turned to zero.Press the 'Reset' button on the front control panel.Check the system pressure gauge is between 1.0 and 1.5 bar.
Your boiler is failing to light the gas or isn't recognizing that a flame is present, meaning your heating and hot water will not work.
Check if other gas appliances in your home are working to ensure gas is being suppliedCheck if your gas meter has credit (if using a pre-payment meter)Press the Reset button once to see if the boiler restarts
Your boiler has stopped working because water is not moving around the internal pipes as it should.
Check that your radiators are turned clockwise to the open positionEnsure the boiler pressure gauge is between 1 and 1.5 barCheck if any external valves on the pipework have been accidentally closedPress the reset button to see if the system clears the air block
Your boiler has lost water pressure and cannot operate safely without being topped up.
Locate the filling loop valves underneath the boilerSlowly open both valves to allow water into the systemClose the valves once the pressure gauge reaches 1.5 bar
Your boiler has failed to light several times and is trying again, which usually means it is struggling to detect a flame or there is a problem with the gas supply.
Check that your gas emergency control valve is in the 'on' positionIf you have a prepay meter, check that you have sufficient creditCheck if other gas appliances, like a hob, are working correctlyPress the Reset button to see if the boiler clears the fault
Your boiler has shut down because it is lacking one of its essential supplies like gas, water, or power.
Check if other gas appliances in your home, like a hob, are working.Ensure the boiler's power switch is on and no fuses have tripped in your consumer unit.Check the pressure gauge and top it up to 1.5 bar if it is below 1.0 bar.Press the 'Reset' button on the front control panel.
on the Chaffoteaux Calydra 24 Green
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 Chaffoteaux 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