BoilerFaultCodesThe 6 most common faults
Your boiler has detected a problem with its primary temperature sensor and has stopped working as a safety precaution.
Why it happens: This fault occurs when the boiler's main flow sensor, which monitors the temperature of the water leaving the heat exchanger, fails to provide a consistent or logical reading. The most common reason is that the internal electrical component of the sensor has worn out or developed a short circuit, preventing the control board from knowing if the water is at a safe temperature.
Full guide for 12Your boiler has detected a problem with its primary temperature sensor and has stopped working as a safety precaution.
Why it happens: This fault occurs when the boiler's main flow sensor, which monitors the temperature of the water leaving the heat exchanger, fails to provide a consistent or logical reading. The most common reason is that the internal electrical component of the sensor has worn out or developed a short circuit, preventing the control board from knowing if the water is at a safe temperature.
Full guide for 13Your boiler has detected a problem with its primary temperature sensor and has stopped working as a safety precaution.
Why it happens: This fault occurs when the boiler's main flow sensor, which monitors the temperature of the water leaving the heat exchanger, fails to provide a consistent or logical reading. The most common reason is that the internal electrical component of the sensor has worn out or developed a short circuit, preventing the control board from knowing if the water is at a safe temperature.
Full guide for 14Your boiler has detected a problem with the temperature sensor that monitors the water returning to the unit, causing it to stop running for safety.
Why it happens: This fault occurs when the boiler's internal computer stops receiving a reliable temperature reading from the sensor on the return pipe. It is usually caused by the sensor itself failing, or a loose connection in the wiring that prevents the signal from reaching the control board. For safety, the boiler shuts down because it can no longer monitor if the water returning from your radiators is at a safe temperature.
Full guide for 20Your boiler has detected a problem with the temperature sensor that monitors the water returning to the unit, causing it to stop running for safety.
Why it happens: This fault occurs when the boiler's internal computer stops receiving a reliable temperature reading from the sensor on the return pipe. It is usually caused by the sensor itself failing, or a loose connection in the wiring that prevents the signal from reaching the control board. For safety, the boiler shuts down because it can no longer monitor if the water returning from your radiators is at a safe temperature.
Full guide for 21Your boiler has detected a problem with the temperature sensor that monitors the water returning to the unit, causing it to stop running for safety.
Why it happens: This fault occurs when the boiler's internal computer stops receiving a reliable temperature reading from the sensor on the return pipe. It is usually caused by the sensor itself failing, or a loose connection in the wiring that prevents the signal from reaching the control board. For safety, the boiler shuts down because it can no longer monitor if the water returning from your radiators is at a safe temperature.
Full guide for 23on the Intergas Combi Compact HRE SB
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 Intergas 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