BoilerFaultCodes
The most common Vokera faults
Your boiler has stopped working because it failed to light the flame after several attempts, usually due to a lack of gas supply or an ignition problem.
Why it happens: This fault occurs when the boiler attempts to start up but cannot successfully establish or detect a steady flame. The most common reasons are a temporary interruption in the gas supply, a build-up of carbon on the ignition parts, or a component failure that prevents the spark from firing.
Check if other gas appliances in your home, like a hob, are working to confirm gas supply.Verify that your gas meter has credit if you use a pre-payment meter.Press the Reset button on the boiler control panel to see if the system restarts.
Your boiler has shut down because it has reached an unsafe temperature, triggered by a safety sensor that prevents the unit from overheating.
Why it happens: This fault occurs when the water inside the boiler gets too hot, causing a safety switch to Cut off the system to prevent damage. The most common reasons are a pump failure that stops water from moving or a blockage in the heat exchanger that restricts flow.
Check that all radiator valves are fully open to allow water to circulate.Ensure your system pressure is topped up to between 1 and 1.5 bar.Turn the boiler off and on again, or press the 'Reset' button to clear the lockout once the system has cooled down.
Your boiler has detected that the water pressure is either too low or the sensor that monitors it is not communicating correctly.
Why it happens: This fault occurs when the boiler's internal sensor detects that there isn't enough water pressure to safely heat your home, or if the sensor itself has developed an electrical fault. The most common reason is a gradual loss of water through a small leak or from bleeding your radiators, which drops the pressure below the required operational limit. When this happens, the boiler shuts down as a safety precaution to prevent the internal components from overheating.
Locate the pressure gauge on the front of the boiler or via the digital screen.If the pressure is below 1 bar, use the filling loop underneath the boiler to carefully top it up to 1.5 bar.Restart the boiler to see if the error clears once the pressure is stable.
Your boiler has detected that the water pressure is incorrect or the sensor that monitors it is not communicating properly.
Why it happens: This fault occurs when the boiler's internal sensor detects that there is not enough water pressure to operate safely. The most common reason is a slow leak somewhere in your central heating system or air being released from the radiators, which causes the pressure to drop below the required threshold. It can also be caused by the sensor itself becoming blocked with debris or failing electronically.
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the filling loop valves to top up the system until the gauge reaches 1.2 bar.Reset the boiler to see if the fault clears.
Your boiler has overheated, causing it to shut down automatically for safety.
Why it happens: This fault occurs when the internal temperature of the boiler exceeds a safe limit, triggering a safety sensor to cut the power to prevent damage. The most common reasons are a blockage in the system or a pump failure, which stops the water from moving quickly enough to carry heat away from the burner.
Check that at least one radiator or bypass valve is fully openTurn the selector switch to the 'OFF/RESET' position for 10 secondsTurn the selector switch back to 'ON' and check if the red light stops flashing
Your boiler has failed to light the gas flame and has shut down as a safety precaution.
Why it happens: This fault occurs when the boiler attempts to start up but cannot detect a sustained flame, leading it to shut down for your safety. The most common reasons include a lack of gas reaching the unit, worn-out spark electrodes that can no longer ignite the fuel, or a faulty sensor that fails to 'see' the flame even if it is lit.
Check that your gas supply is turned on and other gas appliances are workingRotate the control knob to the 'OFF/RESET' position and then back to the 'ON' positionWait for the boiler to attempt to restart; if the red light remains, a professional is required
Your boiler has detected a safety-related issue with its internal components or airflow and has locked itself down to prevent damage.
Why it happens: This fault occurs when the boiler's safety sensors detect that the system cannot safely move air or water through the unit. It is most commonly caused by a mechanical failure in the fan or a blockage in the flue and condensate drainage system that prevents the boiler from 'breathing' correctly. In some cases, it can also be triggered if the unit overheats due to a lack of water circulation.
Check that the system water pressure is between 1 and 1.5 bar on the pressure gaugeTurn the mode selector switch to 'OFF/RESET' for a few seconds, then back to the heater or hot water iconEnsure the external flue terminal is not obstructed by debris or garden growth
Your boiler has likely overheated, causing a safety switch to trip and shut down the system to prevent damage.
Why it happens: This fault occurs when the water inside the boiler exceeds a safe temperature, triggering a mechanical safety switch to cut off the burner. The most common reasons are a failed pump that isn't moving water efficiently, or a build-up of sludge and debris that is restricting flow through the heat exchanger.
Check that your radiator valves are open to allow water to flow.Ensure the system pressure is between 1 and 1.5 bar on the pressure gauge.Wait for the boiler to cool down, then turn the mode selector switch to 'OFF/RESET' for a few seconds before switching it back to 'ON'.