E73 — Modified Flame signal

What does E73 mean?

The boiler has detected a modified flame signal. This is a diagnostic message and typically does not require user action.

• Minor fluctuations in flame detection not causing a fault.
• Internal monitoring status.

Click steps to track your progress.

1. 1

   Observe the boiler's operation; no specific user action is needed for this message.

2. 2

   If other issues arise alongside this message, check other error codes.

3. 3

   If you are concerned about boiler performance, contact a qualified technician for a system check.