BoilerFaultCodesTechnical description
Central heating negative temperature coefficient (NTC) fault
What causes this fault?
This fault occurs when the internal sensor responsible for monitoring your heating temperatures becomes damaged or fails to send a clear signal back to the main control board. The most common reason is that the sensor has physically degraded over time or developed an electrical short, preventing the boiler from knowing how hot the water is. As a safety precaution, the boiler will stop firing to prevent overheating.
This fault is often noticed during the first cold spell of autumn when the heating system is turned on after being dormant all summer.
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.