XFMR_TEMP_F - High transformer temperature, inverter stopped

What does XFMR_TEMP_F mean?

The internal transformer has reached a dangerously high temperature, causing the Sunny Boy to stop operating. The fans will automatically run at maximum speed to cool it down. This is identified as a disturbance message.

• High ambient temperature around the inverter
• Blocked ventilation or fan intakes
• Malfunction of the internal cooling fans
• Internal component issue.

Click steps to track your progress.

1. 1

   Ensure the Sunny Boy has adequate ventilation and its fan intakes are not blocked by dust or debris.

2. 2

   Check if the fans are functioning correctly and spinning at maximum speed.

3. 3

   Allow the inverter to cool down if the ambient temperature is very high.

4. 4

   If the issue persists after cooling or recurs frequently, contact SMA America for assistance.