F.49 — eBUS under voltage

What does F.49 mean?

The eBUS communication system is experiencing an under voltage condition. This can be caused by a short circuit, an overload on the eBUS line, or incorrect polarity from multiple power sources.

• Short circuit on eBUS.
• Overload on eBUS.
• Two power sources on eBUS with different polarity.

Click steps to track your progress.

1. 1

   Reset the boiler by pressing the reset button.

2. 2

   Check the wiring connections for any external eBUS controls (if safely accessible).

3. 3

   If the error persists, contact a qualified service technician to inspect the eBUS wiring and connected devices.