DMLU
Troubleshooting
Project:
Model:
Chk’d:
Date:
Trouble
Motor won’t turn.
Starts, but immediately
stops.
Operates, but stops after
a while.Thermal protector
is activated.
Does not pump.
Inadequate volume.
Overcurrent
Pump vibrates;
excessive noise during
operation.
Cause
(1) Foreign matter hinders level control float from functioning
properly.
(2) Power failure.
(3) Large voltage unbalance.
(4) Significant drop in voltage
(5) There is an open phase
(6) Faulty circuit connection
(7) Blown fuse
(8) Faulty starter
(9) Defective float
(10) Malfunctioning circuit breaker
(11) Foreign matter clogging pump
(12) Motor is shorted out
(13) Motor bearings are frozen
(1) Prolonged dry operation has activated motor protector
and caused pump to stop
(2) High liquid temperature has activated motor protector
and caused pump to stop
(1) Reverse rotation
(2) Valve is closed or partially clogged.
(3) Significant drop in voltage
(4) Discharge head is too high
(5) Large piping loss
(6) Low water level during operation causes vortexing (air
suction)
(7) Leak in discharge piping
(8) Clog in discharge piping
(9) Foreign matter clogging pump
(10) Worn impeller
(1) Large discrepancy between power source and voltage
(2) Significant voltage drop
(3) There is an open phase
(4) Reverse rotation
(5) Low head; pumping too much liquid
(6) Foreign matter clogging pump
(7) Motor bearing is worn or damaged
(1) Reverse rotation
(2) Pump clogged with foreign matter
(3) Piping vibrates
Remedy
(1) Remove foreign matter
(2 - 3) Contact electric power company for remedy
(4) Check power supply
(5) Check power supply; Inspect starter and connections
(6) Correct wiring
(7) Replace with correct size fuse
(8) Replace with correct starter
(9) Repair or replace float
(10) Repair location of circuit
(11) Remove clog from pump
(12) Repair or replace
(13) Repair or replace
(1) Raise the off float level
(2) Lower liquid temperature
(1) Correct rotation
(2) Open valve
(3) Check power supply
(4) Recalculate and adjust
(5) Recalculate and adjust
(6) Raise water level or lower pump
(7) Inspect, repair
(8) Remove foreign matter
(9) Remove foreign matter
(10) Replace impeller
(1) Contact power company for remedy
(2) Contact power company for remedy
(3) Check power supply
Inspect starter & electrical connections
(4) Check rotation
(5) Adjust discharge valve to desired flow
(6) Remove clog from the pump
(7) Repair or replace
(1) Correct rotation
(2) Remove clog from pump
(3) Install support for discharge piping
CALL 1-800-577-8111 FOR SALES AND SUPPORT
CALL 1-800-577-8111 FOR SALES AND SUPPORT