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Eric CastroAug 31, 2025
What does A39 error code mean on Riello UPS?
- PpsilvaAug 31, 2025
If the display of your Riello UPS shows the code A39, it indicates that the batteries have failed the periodic efficiency test. It is recommended to replace the batteries of the UPS, since they are no longer able to maintain the charge for a sufficient autonomy. The replacement of the batteries must be carried out by qualified personnel.