E28 — Flue sensor Fault

What does E28 mean?

This code indicates a fault with the Flue NTC (Negative Temperature Coefficient) sensor, which monitors the temperature of the exhaust gases. The boiler display will show 'E' alternating with '28'. This suggests a problem with the sensor or its connection.

• Faulty Flue NTC sensor.
• Damaged wiring to the Flue NTC sensor.
• Loose connection at the Flue NTC sensor.

Click steps to track your progress.

1. 1

   Note the error code E28 from the boiler display.

2. 2

   Ensure the electrical supply to the boiler is stable (230V ~ 50Hz).

3. 3

   Check for any visible obstructions around the flue terminal outside.

4. 4

   Contact a qualified heating engineer, informing them of the E28 error code.