Heatline E03 Fault Code

The Heatline E03 fault code means: your boiler has shut down because it has detected that the exhaust gases are getting too hot or aren't clearing properly, which could indicate a blockage or a faulty sensor.. It appears on 7 Heatline models in our database.

Technical description: Flue gas temperature sensor fault: The flue thermostat or sensor has detected an obstruction or excessive temperature in the flue.