E72 — Combustion test out of range in autocalibration

What does E72 mean?

During the automatic calibration process, the combustion test results were found to be outside the acceptable range.

• Incorrect positioning or integrity of the sensing electrode.
• Damaged wiring to the sensing electrode.
• Issues with the gas supply or flue recirculation affecting combustion.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the boiler, wait 30 seconds, then turn it back on.

2. 2

   If the error persists, the boiler likely needs re-calibration.

3. 3

   A qualified technician should check the sensing electrode, its cable, and perform a new calibration.