APC Smart-UPS Error Code F04

APC UPS Major Fault

Model: Smart-UPS | Code: F04

Applicable Systems
Symmetra LX

Symptoms

The bypass circuit has a fault. The UPS cannot transfer to bypass mode.

Possible Causes

  • Bypass contactor or relay failure
  • Bypass control circuit fault

Troubleshooting Steps

  1. Step 1: Check the UPS fault log for the specific bypass fault sub-code
    Detailed fault information is obtained
  2. Step 2: Contact APC support with the fault code for diagnosis
    Support confirms the faulty component

How to Reset

To reset: Power-cycle the UPS. If the error persists, contact APC support for repair.

Related APC Fault Codes

Source: APC Smart-UPS User Manual, Schneider Electric/APC

Category: UPS