BoilerFaultCodesThe 6 most common faults
Your boiler's fan is failing to maintain a steady speed, which prevents the system from safely drawing in air and exhausting gases.
Why it happens: This fault occurs when the boiler's internal computer detects that the fan is spinning at an inconsistent or incorrect speed to safely clear exhaust gases. The most common reason is a mechanical failure within the fan motor or a communication error caused by damaged wiring or a faulty control board. Without a steady and predictable airflow, the boiler shuts down as a safety precaution to prevent improper combustion.
Full guide for 29Your boiler has detected a problem with its primary temperature sensor and has shut down as a safety precaution to prevent overheating.
Why it happens: This fault occurs when the boiler's main flow temperature sensor sends an incorrect or garbled signal to the control board, suggesting the sensor has failed or become disconnected. The most common reason is that the internal components of the sensor have worn out over time, or the electrical wiring connecting it to the brain of the boiler has developed a loose connection.
Full guide for 10Your boiler has detected a problem with its primary temperature sensor and has shut down as a safety precaution to prevent overheating.
Why it happens: This fault occurs when the boiler's main flow temperature sensor sends an incorrect or garbled signal to the control board, suggesting the sensor has failed or become disconnected. The most common reason is that the internal components of the sensor have worn out over time, or the electrical wiring connecting it to the brain of the boiler has developed a loose connection.
Full guide for 12Your boiler has detected a problem with its primary temperature sensor and has shut down as a safety precaution to prevent overheating.
Why it happens: This fault occurs when the boiler's main flow temperature sensor sends an incorrect or garbled signal to the control board, suggesting the sensor has failed or become disconnected. The most common reason is that the internal components of the sensor have worn out over time, or the electrical wiring connecting it to the brain of the boiler has developed a loose connection.
Full guide for 13Your boiler has detected a problem with its primary temperature sensor and has shut down as a safety precaution to prevent overheating.
Why it happens: This fault occurs when the boiler's main flow temperature sensor sends an incorrect or garbled signal to the control board, suggesting the sensor has failed or become disconnected. The most common reason is that the internal components of the sensor have worn out over time, or the electrical wiring connecting it to the brain of the boiler has developed a loose connection.
Full guide for 14Your boiler has detected a problem with its internal temperature sensors, which means it cannot accurately monitor the water temperature and has stopped working for safety.
Why it happens: This fault occurs when the boiler’s return sensor, which monitors the temperature of the water coming back from your radiators, sends an incorrect or missing signal to the main computer. The most common reason is that the sensor itself has developed an electrical internal failure, or the wiring connecting it to the control board has become loose or damaged.
Full guide for 20on the Intergas Rapid 25
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
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
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