BoilerFaultCodesThe 6 most common faults
Your boiler has switched itself off because it has detected that the internal water temperature is getting too hot.
Check that all radiator valves are fully open to allow water to circulate.Ensure the system pressure is between 1.0 and 1.5 bar on the pressure gauge.Press the 'Reset' button to see if the fault clears.
Your boiler is failing to light the gas even though it is trying to, which means it cannot provide any heating or hot water for your home.
Check if other gas appliances in your home, like a hob, are working to ensure you have a gas supply.If you have a prepayment meter, check that you have enough credit.Press the 'Reset' button on the front control panel to see if the boiler restarts.
Your boiler has detected that water is not moving through the system properly, causing it to shut down to prevent overheating.
Check the pressure gauge on the front of the boiler and top it up to 1.5 bar if it is low.Ensure all radiator valves are fully open and that your lockshield valves haven't been turned off.Listen for air in the system and bleed your radiators if they have cold spots.
Your boiler has stopped working because water is not moving around the internal system efficiently enough to prevent it from overheating.
Check that the boiler pressure is between 1.0 and 1.5 bar on the gaugeEnsure all radiator valves are fully openCheck if the pump is making any unusual grinding or humming noisesTry restarting the boiler using the reset button
Your boiler has detected a faulty internal temperature sensor that monitors the water returning from your radiators, which prevents the system from heating effectively.
Full guide for 30 - 40Your boiler has detected very cold temperatures and has automatically turned on the pump to prevent the internal pipes from freezing.
Ensure your main gas and electricity supplies remain switched onCheck that your internal room thermostat is turned up to a normal heating temperatureWait for the boiler to complete its cycle; the lights should turn off once the water temperature rises
on the Chaffoteaux Minima MX2 24FF / 30FF
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