Alarm 354 (or 503, 186) Compressor speed too low — Inverter safety function reduces compressor speed

What does Compressor speed too low 354 mean?

This alarm signifies that the inverter's safety function has reduced the compressor speed below the lowest permitted working range, indicating a potential issue with the compressor or refrigerant circuit.

• The compressor does not compress the refrigerant sufficiently.
• Compressor breakdown.
• Issue with the inverter's safety function.

Click steps to track your progress.

1. 1

   Check the indoor module/control module display for specific action instructions.

2. 2

   Ensure the system is not requesting extreme operating conditions.

3. 3

   If the alarm persists, contact a qualified technician to inspect the compressor and inverter.