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Troubleshooting 33
UPS cannot communicate with the host computer
Action:
• Verify only one communications port is connected to the host computer ("Connecting the host computer"
on page 14).
• If an option card is installed, verify the host computer is only connected to the option card. Installing an
option card automatically disables the built-in serial and USB communications ports.
UPS emits a slight clicking noise
Action: The UPS is automatically correcting high or low AC voltage on the utility line. No action is required.
Site wiring condition
Action: Contact a qualified electrician to be sure that:
• The line and neutral wires are not reversed in the wall outlet.
• A ground wire connection does not exist.