BoilerFaultCodesThe 6 most common faults
Your 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 sensor sends an incorrect or interrupted signal to the control board, suggesting the sensor has either failed or become disconnected. The most common reason is general wear and tear of the internal thermistor or moisture damage affecting the electrical contacts within the sensor wiring.
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 sensor sends an incorrect or interrupted signal to the control board, suggesting the sensor has either failed or become disconnected. The most common reason is general wear and tear of the internal thermistor or moisture damage affecting the electrical contacts within the sensor wiring.
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 sensor sends an incorrect or interrupted signal to the control board, suggesting the sensor has either failed or become disconnected. The most common reason is general wear and tear of the internal thermistor or moisture damage affecting the electrical contacts within the sensor wiring.
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 sensor sends an incorrect or interrupted signal to the control board, suggesting the sensor has either failed or become disconnected. The most common reason is general wear and tear of the internal thermistor or moisture damage affecting the electrical contacts within the sensor wiring.
Full guide for 14Your boiler has detected a problem with one of its internal temperature sensors, which prevents it from heating your home or water safely.
Why it happens: This fault occurs when the boiler's internal computer receives an incorrect or missing signal from the return temperature sensor. The most common reason is that the sensor itself has worn out and failed, though it can also be caused by loose wiring or water damage to the electrical connections inside the casing.
Full guide for 20Your boiler has detected a problem with one of its internal temperature sensors, which prevents it from heating your home or water safely.
Why it happens: This fault occurs when the boiler's internal computer receives an incorrect or missing signal from the return temperature sensor. The most common reason is that the sensor itself has worn out and failed, though it can also be caused by loose wiring or water damage to the electrical connections inside the casing.
Full guide for 21on the Intergas Compact HRE OV
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