APC UPS Fault: APC Symmetra LX Error Code UPS Fault

Symptoms

The APC Symmetra LX PowerView displays 'UPS Fault' message. An internal fault has been detected in a power module. The UPS Fault message always occurs when there is a bad power module failure. The load may transfer to bypass or lose power depending on redundancy configuration.

Possible Causes

Power module internal component failure (IGBT, capacitor, or control circuit)
Power module firmware corruption
Power module cooling fan failure causing thermal shutdown
Backplane bus connector damage or corrosion

Troubleshooting Steps

Step 1: Read PowerView display for 'UPS Fault' and any preceding module failure messages
'UPS Fault' displayed with specific power module slot identified
Step 2: Navigate PowerView to identify which power module slot reported the fault
Faulty power module slot number displayed
Step 3: Remove the identified power module following the module replacement procedure
Module safely removed with system in bypass or redundant state
Step 4: Replace with known-good power module and clear fault via PowerView
New module accepted, 'UPS Fault' cleared, system returns to normal

How to Reset

To reset: 1) Remove the faulty power module. 2) Insert replacement power module. 3) System auto-detects new module and clears fault. 4) Verify system returns to online status. Caution: Maintain redundancy during module replacement.

Common Replacement Parts

Symmetra Power Module: APC Symmetra LX Power Module (Match to system kVA rating (4-16 kVA))

Frequently Asked Questions

Q: What does 'UPS Fault' mean specifically?
'UPS Fault' is a catch-all message that appears whenever a power module reports a critical failure. The PowerView will also display which module slot has the failure.
Q: Can I run the Symmetra LX with one power module failed?
If the system has redundancy (extra power modules beyond what the load requires), the UPS will continue operating. Without redundancy, the load transfers to bypass.

APC Symmetra LX Error Code UPS Fault