Fault E3 — Insufficient heat transfer or combustion controller calibration issue

What does E3 mean?

Fault E3 indicates a problem with heat transfer or an issue during the automatic calibration of the combustion controller. The boiler cannot operate correctly if heat is not being transferred efficiently or the combustion is not calibrated.

• Inadequate heat transfer
• Faulty ionization electrode gap
• Incorrect gas type allocation (coding address 82)
• Incorrect gas train setting
• Flue gas system issues (e.g., recirculation)

Click steps to track your progress.

1. 1

   Ensure adequate heat is being drawn off from the boiler (e.g., turn up thermostats).

2. 2

   Press the reset button (R) on the boiler control unit.

3. 3

   Check the gap between the ionization electrode and the burner gauze assembly.

4. 4

   Verify the correct gas type allocation in coding address 82 and the gas train setting.

5. 5

   Inspect the flue system for any blockages or issues that might cause flue gas recirculation.