This is the complete fault table for the Voltronic Otima II ups — all 12 codes from the official manual on one page. On this Voltronic device, a fault code means the unit has entered protection and stopped normal operation; a warning leaves it running. The exact indication (LED pattern or display code) is listed per code below.
Last checked against the official manuals on July 27, 2026.
Fault code 01 shown on the display; the UPS has detected a fault condition: Bus start fail.
CauseBus start fail.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Fault code 02 shown on the display; the UPS has detected a fault condition: Bus over.
CauseBus over.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Fault code 03 shown on the display; the UPS has detected a fault condition: Bus under.
CauseBus under.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Fault code 11 shown on the display; the UPS has detected a fault condition: Inverter soft start fail.
CauseInverter soft start fail.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Fault code 12 shown on the display; the UPS has detected a fault condition: Inverter voltage high.
CauseInverter voltage high.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Fault code 13 shown on the display; the UPS has detected a fault condition: Inverter voltage Low.
CauseInverter voltage Low.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Fault code 14 shown on the display; the UPS has detected a fault condition: Inverter output short.
CauseInverter output short.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Fault code 27 shown on the display; the UPS has detected a fault condition: Battery voltage too high.
CauseBattery voltage too high.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Fault code 28 shown on the display; the UPS has detected a fault condition: Battery voltage too low.
CauseBattery voltage too low.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Fault code 41 shown on the display; the UPS has detected a fault condition: Over temperature.
CauseOver temperature.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Fault code 43 shown on the display; the UPS has detected a fault condition: Over load.
CauseOver load.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Fault code 45 shown on the display; the UPS has detected a fault condition: Charger failure.
CauseCharger failure.
Recommended fixRestart the unit. If the fault happens again, contact your installer or the repair centre.
Source:Otima-II-User-Manual.pdf· page 17
Send us the code on your screen and a Voltronic technician will reply with the exact steps for your unit. Support is free for life — a first diagnosis never needs a callout.
Compiled from official Voltronic user manuals. Always consult your device manual and a qualified technician before performing repairs.