BoilerFaultCodes Burner On
Your boiler is operating exactly as it should and is currently heating your home or water.
Baxi Solo 3 PFL System 40 Fault codes & diagnostics
11 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
System Natural Gas 2001-2006 Discontinued
GC Number 41-075-26
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Severity at a glance
Each cell = one fault code. Hover to identify. 2 Emergency
6 High
3 Low
Fault codes
All 11 documented codes
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E02 Your boiler has detected that the internal mechanism responsible for moving water around your heating system is not working correctly, which will stop your radiators and hot water from warming up.
Your boiler has detected that the internal mechanism responsible for moving water around your heating system is not working correctly, which will stop your radiators and hot water from warming up.
Parts commonly replaced
- Central heating pump
- Pump head
- Wiring harness
E24 Your boiler has detected an issue with the component that controls the gas supply, meaning it cannot safely ignite or maintain a flame to heat your home.
Your boiler has detected an issue with the component that controls the gas supply, meaning it cannot safely ignite or maintain a flame to heat your home.
Parts commonly replaced
- Gas valve
- Wiring harness
- PCB
E26 Your boiler has detected an issue with the internal air flow system, which prevents it from safely lighting the burner.
Your boiler has detected an issue with the internal air flow system, which prevents it from safely lighting the burner.
Parts commonly replaced
- Air Pressure Switch
- Venturi
- Flue fan
Fan On
Your boiler is operating normally, and this indicator light simply shows that the internal fan is running as expected to vent the system.
Lockout Your boiler has stopped working because it has detected a temperature that is too high and has temporarily disabled itself for safety.
Your boiler has stopped working because it has detected a temperature that is too high and has temporarily disabled itself for safety.
What to check first
- Turn the boiler control knob to the 'OFF' position.
- Wait for at least 10 seconds to allow the system to reset.
- Turn the control knob back to your desired setting.
Parts commonly replaced
- Overheat Thermostat
- Pump
- Temperature Sensor
Related codes
lockout light Your boiler has detected a safety issue and stopped working to protect your home, meaning you currently have no heating or hot water.
Your boiler has detected a safety issue and stopped working to protect your home, meaning you currently have no heating or hot water.
Parts commonly replaced
- Ignition lead
- Gas valve
- PCB
- Flame rectification probe
Overheat Your boiler has become too hot and has automatically shut itself down to prevent damage or safety issues.
Your boiler has become too hot and has automatically shut itself down to prevent damage or safety issues.
What to check first
- Check that your radiator valves are open to allow water to circulate
- Let the boiler cool down for 15 to 30 minutes
- Press the reset button or turn the control knob to the 'Off' position and then back to 'On'
Parts commonly replaced
- Circulation pump
- Overheat thermostat
- Flow temperature sensor
Related codes
Overheat light Your boiler has become too hot and has automatically shut down as a safety precaution to prevent damage.
Your boiler has become too hot and has automatically shut down as a safety precaution to prevent damage.
What to check first
- Locate the thermostat control knob on the boiler front panel.
- Turn the knob fully anticlockwise to the 'OFF' position.
- Wait 10 seconds, then turn the knob back to your desired temperature setting to reset the light.
Parts commonly replaced
- Overheat Thermostat
- Circulation Pump
- Heat Exchanger (de-scaling)
Related codes
Overheat Neon Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.
Parts commonly replaced
- Overheat thermostat
- Pump
- PCB
- Diverter valve
Related codes
Pilot On
Your boiler is operating exactly as it should and the pilot light is successfully lit.
Status & diagnostic codes 7 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
7 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
30 Status Your boiler has detected an issue with the airflow or flue system, meaning it has shut itself down as a safety precaution to prevent dangerous gases from building up. 40 Status Your boiler has detected a problem with the fan or the airflow inside, causing it to shut down for safety reasons. 50 Status Your boiler is failing to light the burner because it cannot detect a flame, meaning your heating and hot water will not work. 60 Status Your boiler has detected a problem with the fan or the airflow inside the unit, causing it to shut down to stay safe. 70 Status Your boiler has detected an internal temperature fault and has shut down to prevent overheating. 80 Status Your boiler has detected an issue with the heat output and has safely shut itself down to prevent damage. Boiler On Status Your boiler is receiving electrical power and is currently operating normally.