Alarm 264 — Permanent communication error with inverter

What does 264 mean?

This alarm signifies a persistent communication issue between the NIBE SMO 20 control module and the inverter (F2120). It will be displayed on the indoor unit's screen.

• Loose or damaged communication wiring to the inverter.
• Faulty inverter unit.
• Software or firmware incompatibility.

Click steps to track your progress.

1. 1

   Check all communication cables between the SMO 20 control module and the inverter for secure connections.

2. 2

   Power cycle the NIBE SMO 20 control module and the inverter by turning off the main power and then turning it back on after a few minutes.

3. 3

   If the alarm persists, contact a qualified service technician to diagnose the inverter or communication module.