Alarm 229 — Short operation times in 2-pipe cooling

What does Alarm 229 mean?

The compressor in 2-pipe cooling mode is stopping and starting too frequently, leading to short operation times. This often occurs when the supply line temperature drops too rapidly.

• Aggressive regulation in cooling mode causing the supply line (BT12) temperature to drop too quickly.
• Software bug leading to premature compressor shutdown.
• Low refrigerant levels or other issues causing inefficient cooling.

Click steps to track your progress.

1. 1

   Update the NIBE SMO 20 firmware to version 8700R4 or later.

2. 2

   Verify the system's cooling mode settings are appropriate for current conditions.

3. 3

   If the problem persists, have qualified service personnel check the refrigerant levels and system balance.