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The device comes with pre-programmed defaults, but these can be customized:
| Problem | Probable Cause | Solution | | :--- | :--- | :--- | | | No power on input side or internal fuse blown. | Check upstream breaker. Is the incoming L-N voltage present? | | Constantly clicking on/off | Voltage is bouncing at the trip threshold (e.g., 172V - 178V). | Increase the LUP (Under-voltage) hysteresis by setting the delay longer. | | Trips during lightning, but not heavy load | Over-voltage setting is too low (below 270V). | Set OUP to 280V. Lightning surges are nanoseconds; the delay will ignore them. | | Unit is hot to the touch | Normal up to 50°C (122°F) at 160A. | If over 60°C, you may have loose terminals or you are exceeding 160A. | | Screen works, but no output | Unit is in "Wait" mode (Voltage is safe, but counting down delay). | Look for a countdown timer on screen. Wait 30 seconds. | tomzn tovpd160ec manual better