What should I do if my Riello MCM 10 UPS displays L26 indicating an output short circuit?
- KKatelyn GomezSep 23, 2025
If the Riello UPS display shows one or more of the following codes: L26, it indicates an output short circuit. Switch the UPS off. Disconnect all the loads relating to the phases affected by the short circuit. Restart the UPS. Re-connect the loads one at a time in order to identify the fault.






