Grundfos MQ 35
When pump is turned on it just hums. I inserted screwdriver and the motor turns freely. No warning light is on. System was reset. Still just hums, motor doesn't start. What could it be?
Garden - Grundfos - MQ3-35 3/4 HP Pressure Booster Pump
Answers & Comments
Check the capacitor or the centrifugal switch.
Is that the pressure switch?
I'm having this problem and the capacitor is OK, motor turns. Don't have means of testing the pressure switch