E77 — Current out of range

What does E77 mean?

The boiler's internal current measurements, often related to flame detection, are outside the expected range.

• Incorrect positioning or integrity of the sensing electrode.
• Flue gas recirculation.
• Issues with the automatic calibration function.

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 may require re-calibration of its combustion parameters.

3. 3

   A qualified technician should check the sensing electrode and flue system, and enable automatic calibration.