BoilerFaultCodesThe 6 most common faults
Your boiler has automatically shut down to protect itself, likely because it got too hot or experienced a temporary glitch.
Locate the main control knob on the front panel.Turn the knob to the OFF position and wait at least 10 seconds.Turn the knob back to the ON position to attempt a reset.
Your boiler has tried to light itself five times without success and has shut down for safety purposes.
Check if your gas supply is turned on and other gas appliances are working.Verify if your gas pre-pay meter has credit.Press the reset button on the front of the control box for a few seconds.
Your boiler appears to have no power reaching it at all, meaning the control lights are off and it cannot start up to provide heating or hot water.
Check that the main boiler power switch (usually a red fused spur near the boiler) is turned into the ON position.Ensure your room thermostat or programmer is turned up and calling for heat.Check your home's main consumer unit (fuse box) to see if a circuit breaker has tripped.
Your boiler has detected that it is trying to heat up without enough water inside it, which could cause the unit to overheat.
Check your external system pressure gauge (usually in an airing cupboard or under the sink) to ensure it is between 1 and 1.5 barEnsure all radiator valves and boiler isolation valves are fully openBleed your radiators to remove any trapped air that might be blocking water flow
Your boiler has switched itself off because it has reached a temperature that is too high to operate safely.
Locate the overheat reset button on the front or underside of the boiler control boxPress the reset button once to see if the boiler restartsCheck that all radiator valves are open and your pump is running
Your boiler has detected that it got too hot or lost power, so it has automatically turned itself off to stay safe and needs to be reset.
Turn the boiler settings dial to the 'Reset' position (or press the reset button if applicable).Wait for the boiler to cycle through its ignition sequence.If the light stays on, check if your heating system has enough water pressure or if a radiator valve is stuck closed.
on the Baxi Solo 3 40 PF
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 Baxi 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