How to fix Riello UPS if it is connected to the mains, but does not switch to stand by mode (the display does not light up)?
- Jjacob05Sep 8, 2025
If your Riello UPS doesn't switch to stand-by mode, verify the connection to the input terminal. The UPS cannot function without the neutral connection. Ensure the 1/0 switch is set to 1 and that the isolator is closed. Confirm that mains power is present and restore the protection if the upstream protection device has intervened, ensuring there is no overload or short circuit on the UPS output.