dougrainer wrote:
There is no sensor for overfilling. Odds are, either the solenoid that controls power to the Pump motor is bad or the motor is bad. At the pump, you will see either 1 or 2 solenoids. One solenoid will have a heavy gauge wire that goes to the pump motor. Jump the 2 LARGE posts on that solenoid. That will apply power directly to the Motor. If it does NOT run and you are positive you have good 12 volt power to that solenoid the motor is bad. IF the motor runs, then either the solenoid is bad or the activation wire to that solenoid is not functioning. Doug
Really need year model of RV and model of HWH system.
Just to add to this great post, some of these are behind fuses, check those too if you have no power to the pump. Some are directly in the solenoid (strange).