Alert 429 (Flash Code 23) — OD Inverter DC Link Low Voltage

What does 429 mean?

The outdoor unit's inverter has detected a low DC link voltage. If this condition occurs repeatedly, the system will lock out. The inverter LEDs will flash code 23 (Red: Two Flashes, Green: Three Flashes).

• Low DC link voltage in the inverter.
• Loose wire connections at the inverter or compressor.
• Compressor winding resistance out of range or ground issue.
• Input power out of range.

Click steps to track your progress.

1. 1

   Check wire connections (U, V, W) at the inverter plug and compressor.

2. 2

   Check compressor winding resistance and for ground issues.

3. 3

   Verify input power is within the acceptable range (208/230VAC +10%).

4. 4

   Check DC Link voltage and MICOM Sensing voltage. If out of range, replace the inverter; otherwise, suspect a mechanical compressor issue.

5. 5

   Refer to the outdoor unit service manual for detailed troubleshooting.