Applicable Systems
Symmetra LX
Symptoms
One or more input phases are missing. The UPS cannot operate on all phases.
Possible Causes
- Input phase wire disconnected or broken
- Circuit breaker for one phase tripped
Troubleshooting Steps
- Step 1: Check all input phase voltages at the UPS terminals
One or more phases are missing - Step 2: Restore the missing phase by fixing the wiring or resetting the breaker
All phases are present
How to Reset
To reset: Restore all input phases, then restart the UPS.
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Source: APC Smart-UPS User Manual, Schneider Electric/APC
Category: UPS
Published: 2026-10-26
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