Alert 432 (Flash Code 28) — OD Inverter DC Link High Voltage

What does 432 mean?

The outdoor unit's inverter has detected a high DC link voltage, exceeding 480 VDC. If this condition occurs frequently, the system will lock out. The inverter LEDs will flash code 28 (Red: Two Flashes, Green: Eight Flashes).

• DC link capacitor voltage greater than 480 VDC.
• 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

   Disconnect power to the outdoor unit and restart to clear the alert.