Baxi · Duotec+ GA Compact Boilers
The NTC fumes sensor, which measures the temperature of the exhaust fumes, is defective or has a wiring problem. This can be a safety concern.
Click steps to track your progress.
Press and hold down the Reset button for 2 seconds to try clearing the fault.
Ensure the boiler's power supply is stable.
If the fault persists, contact an Authorised Service Centre to check the probe and wiring.