Usually means the electronics in the pump has detected there is no flow through the pump. Check all inlets, clear skimmer baskets, and ensure the primer box (witht he removable see through lid near the pump itself) has water in it before starting the pump. If there is no output back into the pool, there is no actual water flow, and hence the filter will show the "no flow" light. If there is good flow through the system and the light is staying on, then probably just a problem with the light or flow sensing circuit.
No flow light is on
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