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What can cause 'uLF' to display on ATV312 Solar drive.
Issue:-
ULF - Underload detected fault

Cause:-

• Not enough water to pump
• Pump blocked

Resolutions:-

• Check if the pumping water level is OK
• Check if the pump is blocked
• If there is enough water and the pump is not blocked: set [State Un ld. function] SLUL to AUtO

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