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Why is my Conext CLNA showing an alarm code: 4700 (Low Power Wrn Service Alert)?

Customer is calling to confirm alarm code: 4700 (Low power wrn Service Alert).

Product Line: 
Conext CL 18000NA Conext CL 25000NA

On site troubleshooting

Thumb screw should be inspected for the correct torque value.
Please see the attached picture.
4700 Low power wrn - The input PV power is low. The unit does not go online and recovers when sufficient input power is available.
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