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
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.
Troubleshooting 33
