pump not turing on

it sounds to me like the air button may not be working. You may have a small hole in the bellows which is the part that sends the air down the air tubing to the air switch in the motor. If there is not enough air being pushed down to the switch it will not activate the motor. You need a new air button or a new air switch in the motor. Pull the pump out and plug it into an outlet. take a straw and blow into the air switch while the pump is plugged in. it the motor turns on then you know you  need an air button on the top of the tub. If the motor does NOT turn on then you need an air switch for the motor.