BoilerFaultCodesTechnical description
Primary temperature sensor (NTC) fault
What causes this fault?
This fault occurs when the sensor responsible for monitoring the heat of the water inside the boiler fails or sends an incorrect signal. The most common reason is that the sensor has physically degraded over time or developed an electrical short, meaning the boiler can no longer safely track temperature. Because the system doesn't know how hot the water is, it shuts down to prevent the unit from overheating.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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