Yes or c.breaker, try to test the terminal voltage to the motor-pump, if there are voltage the pump-motor is faulty. Otherwise, test the adapater+battery, fuse or c.brekaer or main switch, and ANY LOOSE wires or connector. However they have some RELAIS, see if the relais is coming ON, and try to clean the contacts with contacts cleaner. Look for some small switch, if there are close or open test with the multimeter for continuity.
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Yes or c.breaker, try to test the terminal voltage to the motor-pump, if there are voltage the pump-motor is faulty. Otherwise, test the adapater+battery, fuse or c.brekaer or main switch, and ANY LOOSE wires or connector. However they have some RELAIS, see if the relais is coming ON, and try to clean the contacts with contacts cleaner. Look for some small switch, if there are close or open test with the multimeter for continuity.
God bless you