8
P/N O&M-BG2GRINDER
TROUBLESHOOTING
The troubles listed below are potential problems involving the pump. Other troubles can occur from
faulty control box operation. Consult control box instructions for troubleshooting list involving the
control box.
PROBLEM PROBABLE CAUSE
Pump will not run. Tripped breaker, blown fuse, poor electrical connection, interruption of
power, improper power supply.
Float switch defective or restricted.
On single phase pumps, electronic start switch or capacitors blown.
Overload in motor tripped.
Solid material lodged in pump inlet.
Pump runs, but does not Pump impeller may be air locked. Start and stop pump several times to
pump liquid from basin. purge air. Check to ensure vent hole in volute is open and clean.
Lower “OFF” float may be set too low, allowing air into pump.
Pump inlet or valves in discharge pipe may be clogged.
Discharge valve may be closed.
Pump hums, but does not run. Incorrect voltage.
Pump inlet plugged.
Cutter jammed or loose on shaft, worn or damaged.
Pump delivers low volume Low voltage.
of water. Discharge restricted.
Check valve stuck closed or installed backwards.
Pump motor damaged / worn.
Pump may be air locked.
Cutter loose or jammed on shaft, worn or damaged.
Pump is noisy. Grinder impeller may be rubbing against grinder ring due to
misalignment, bent shaft or object stuck in impeller.
Grinder assembly may be partially clogged.
Pump cavitation due to low discharge pressure.
Pump cycles frequently. Check valve stuck closed or installed backwards.
Ground water entering basin.
Fixtures are leaking.
Pump will not turn off. Float switch defective or movement restricted.
H-O-
A switch in panel is in “HAND” position.
Pump may be air locked.
Excessive inflow / pump not sized for the application.
Grease and solids Pump “ON” switch may be set too high.
accumulated in basin and Debris may have accumulated around lower float weight causing pump
will not pump out. to turn off too soon. Clean debris away from weight and cord.
Red light illuminated at Moisture detection in double seal pumps indicating service is required.
control box. Lower seal has failed. Secondary seal still functioning.
Circuit breaker trips. Electrical short to ground.
Check troubleshooting in control panel before pulling pump.
Check all electrical cords for damage.
Pull pump and take resistance readings of motor to determine if problem
is in the pump or control box.
