PUMP JUST RUNS AND WONT SHUT OFF MQ3-45 - Grundfos MQ3-45 1 HP Pressure Booster Pump

DOES THIS SYSTEM FEED YOUR HOME.DOES IT HAVE PSI TANK. WHAT COULD BE HAPPENING.IS.THERE IS A PRESSURE SWITCH (fyg-2) THAT WAS INSTALLED ON YOUR SYSTEM. THIS ITEM, DEPENDING ON IT'S MANUFACTURE.COME PRESET AT 20/40 PSI OR 30/50 PSI OR 40/60 PSI. THAT MEANS ON START/OFF START PSI. SO IF YOUR PUMP CONTINUES TO PUMP AND WON'T TURN OFF.YOUR SYSTEM PUMPS MAY HAVE SOME WEAR TO IT OR A POSSIBLE HOLE IN THE DROP PIPE THAT IS NOT ALLOWING YOUR SYSTEM TO REACH PSI THAT IT SET FOR. ALL U HAVE TO DO IS READJUST THE PRESSURE SWITCH TO THE PSI READING THAT IS ON PSI GAUGE.