Liebert Hipulse D Ups Manual Fix -
Title: Service Advisory: Troubleshooting and Rectifying Common Issues in the Vertiv Liebert Hipulse D UPS
- Identify the faulty component and order a replacement.
- Follow proper safety procedures to prevent electrical shock or injury.
- Replace the faulty component and test the UPS to ensure it is functioning correctly.
Fault #2: Static Bypass Short Circuit Error – "E26: BTB (Backfeed Thyristor) Short"
Symptoms: UPS attempts to transfer to bypass, but immediately goes to fault. The unit shows "LOAD ON INVERTER" but an alarm persists. You cannot transfer manually. liebert hipulse d ups manual fix
Check Battery Breakers: Ensure the battery circuit breakers are closed [3]. Identify the faulty component and order a replacement
- The Hipulse D monitors tachometer signal, not just voltage. A slow or noisy fan triggers failure.
- Replace fan with Liebert-approved unit (same RPM rating). Generic fans often mismatch pulse-per-revolution specs.
- Clear fault: After replacement, go to Alarms → Reset → “Fan Fault Acknowledge” (hold 5s).
- Check fuse F51 (250 mA, slow-blow) on the control interface board (located behind display panel).
- Reseat ribbon cable between front panel and main logic board (CN10 connector).
- If display lights but keys don’t work, perform keypad self-test: Power off display, hold Enter + Esc, reapply power.
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