What does a red LED on the operating panel mean?
If the pump has detected one or more alarms or warnings, the first LED switches from green to red. When the fault has been resolved, the operating panel switches back to operating status and the LED returns to green. If multiple alarms are active simultaneously, the LEDs only show the error with the highest priority. (Page 11, 17)
From the official Grundfos Ups3 15 50 65 manual, page 11
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