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Hello my name is ***** ***** I will assist you. A continuous alarm can be due either to overheating, no oil pressure or else low gear oil in the reservoir. sice you replaced the impeller i am assuming that the engine is not overheating. As for the oil pressure you can verify that with the oil pressure gauge. Thus i suggest you to check the gear oil reservoir on top of the engine, make sure that the oil level is between the two lines. If it is already make sure that the float inside the reservoir is not stuck in the down position, try pulling it up using a screw driver or something thin.
If you require further assistance let me know.