A. If the inlets are Supervalves, plug the powerhead directly into to valve. If the powerhead works, the problem is in the high voltage lines in the hose – likely a blown fuse in the hose but also
B. Check brush for bad neck tilt switch or reset button.
C. Put power directly to brush motor to see if the motor is bad. (This may be a bit advanced for most do-it-yourselfers and involves coming in contact with 110 volt electrical wires. If you are not comfortable working with high-voltage, consider scheduling a SERVICE CALL to avoid potential hazard).
D. Check cord connections from hose to brush to make sure everything is securely connected.
E. Check to see that Supervalves/Electavalves have 110 volts.