Error code
live-status-lamp-yellow-solid Status lamp yellow: backup mode
Applies to 1 model
S735
What this means
Backup mode is active.
What you can check yourself
- Check the display for operating information and instructions.
- If backup mode was not expected, contact the installer.
Still not resolved? Contact a qualified installer or servicer.
See the official NIBE manualA deep link to the manufacturer's own PDF for full technical detail. We link to manuals, we never host them.