Fault ED (Detailed 191) — Burner fault: internal fault

What does ED mean?

The burner is in fault mode due to an internal fault within the boiler's control system. This is a general error indicating a problem with the boiler's internal electronics or software.

• Internal fault

Click steps to track your progress.

1. 1

   Press the reset button R on your boiler to attempt to clear the internal fault.

2. 2

   Ensure the boiler has a stable power supply and there haven't been recent power interruptions.

3. 3

   If the fault persists after multiple resets, it likely indicates a control unit malfunction, which will require replacement by a qualified technician.