Common problems guide

The most common Chaffoteaux boiler problems

The faults we see most often across the Chaffoteaux range — with plain-English causes, what to check first, estimated repair costs, and whether it's a DIY job or needs a Gas Safe engineer. Based on fault-code data across 20 Chaffoteaux boiler models.

185 unique codes
20 models covered
8 DIY-safe (top 8)
8 engineer needed

The most common Chaffoteaux faults

01
8.5 High DIY-safe

Your boiler is trying to start but the burner is failing to ignite, meaning you currently have no heating or hot water.

What to try first

Check if other gas appliances, like a hob, are working to ensure gas is reaching the propertyCheck that your gas pre-payment meter (if applicable) has creditPress the Reset button once to see if the boiler restarts

Est. cost
£100-280
Parts
Ignition electrodes, Gas valve, Printed Circuit Board (PCB)
Full guide for Britony II 30FF 8.5
02
8.7 High DIY-safe

Your boiler has detected that the water temperature is too low for it to operate correctly, which usually means the water is not circulating properly or a sensor is faulty.

What to try first

Check that your boiler pressure is between 1 and 1.5 bar on the gauge.Ensure all radiator valves are fully open.Restart the boiler using the reset button to see if the error clears.

Est. cost
£90-180
Parts
Temperature Sensor (NTC Thermistor), Circulation Pump, Heat Exchanger
Full guide for Britony II 40FF 8.7
03
8.12 High DIY-safe

Your boiler has detected that the water pressure is too low to operate safely, causing it to shut down.

What to try first

Locate the filling loop (usually a silver flexible hose) under the boiler.Slowly open the small valves to allow water into the system.Watch the pressure gauge and close the valves once it reaches between 1.0 and 1.5 bar.

Est. cost
£0-120
Parts
Filling loop, Pressure sensor, Expansion vessel
Full guide for Britony II 30FF 8.12
04
8.1 High DIY-safe

Your boiler is unable to start the pilot flame, which means it cannot provide any heating or hot water until the ignition process is successful.

What to try first

Check if your gas supply is turned on and other gas appliances are workingPress the reset button once to try and restart the ignition sequenceEnsure there is credit on your pre-payment gas meter

Est. cost
£100-280
Parts
Ignition electrode, Gas valve, Printed Circuit Board (PCB)
Full guide for Britony II 30FF 8.1
05
01 High DIY-safe

Your boiler has switched itself off because it has reached an unsafe temperature and needs to cool down before it can run again.

What to try first

Turn off the boiler and allow it to cool for 20 minutes.Ensure all radiator valves are fully open to allow water to circulate.Press the Reset button on the front control panel to restart the system.

Est. cost
£100-280
Parts
Overheat Thermostat, Circulation Pump, Temperature Sensor (NTC)
Full guide for Calydra 23 Green 01
06
03 High DIY-safe

Your boiler is failing to light the gas burner, which means it cannot provide heat or hot water.

What to try first

Check if other gas appliances in your home, like a hob, are working to confirm your gas supply is on.Ensure your gas meter has credit if you use a prepay meter.Press the 'Reset' button on the front control panel and wait for the boiler to restart.

Est. cost
£100-£280
Parts
Ignition Electrode, Flame Sensing Probe, Gas Valve
Full guide for Calydra 23 Green 03
07
07 High DIY-safe

Your boiler has stopped working because water is not moving around the internal system properly, causing it to shut down to prevent overheating.

What to try first

Check that the boiler pressure gauge is between 1 and 1.5 barEnsure all radiator valves and isolation valves under the boiler are fully openGently bleed your radiators to remove any trapped air pocketsReset the boiler using the 'R' or Reset button

Est. cost
£150-£350
Parts
Circulation Pump, Primary Heat Exchanger, Main PCB
Full guide for Calydra 23 Green 07
08
08 High DIY-safe

Your boiler has detected that there is not enough water pressure in the system to operate safely.

What to try first

Locate the filling loop (usually a silver braided hose with small valves underneath the boiler).Open the valves slowly until you hear water flowing and the pressure gauge reaches between 1.0 and 1.5 bar.Close the valves tightly and restart the boiler.

Est. cost
£0-120
Parts
Filling loop, Expansion vessel, Pressure sensor
Full guide for Calydra 23 Green 08

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