When a refrigeration compressor motor fails to start the FIRST thing that should be check

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When a refrigeration compressor motor fails to start, the FIRST thing that should be checked for is a _____.

A.loose expansion valve control bulb

B.low differential setting on the H.Pcutout

C.blown fuse in the motor circuit

D.faulty suction pressure regulator

请帮忙给出正确答案和分析,谢谢!

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