What to do if my MacroAir Technologies AirVolution-D 370 shows a Supply Voltage High Warning?
- JJoseph YoderAug 26, 2025
If you receive a Supply Voltage High Warning on your MacroAir Technologies Fan, it means the controller is detecting that the bus voltage is nearing the upper threshold. You can try the following steps to resolve this: 1. Turn off the incoming power for two minutes, then turn it back on. 2. Confirm that the power supply is within the fan’s specified limits. 3. Check for any voltage spikes using a power quality recorder. 4. Verify that the motor wiring is correct.




