Fault E3 (Detailed 204) — Burner fault: low heat transfer or temperature limiter shutdown

What does E3 mean?

The burner is in fault mode because heat transfer is too low during calibration, or the temperature limiter has activated and caused a shutdown. This indicates the boiler is not effectively transferring heat or has reached a critical temperature.

• Heat transfer too low during calibration
• Temperature limiter caused shutdown

Click steps to track your progress.

1. 1

   Ensure adequate heat transfer within the system; check for closed valves or blockages.

2. 2

   Allow the boiler to cool down if it feels excessively hot.

3. 3

   Press the reset button R on your boiler.

4. 4

   If the problem persists, a qualified technician should investigate the heat transfer system or temperature limiter.