SECTION 5
TROUBLESHOOTING GUIDE
SYMPTOMS & REMEDIES
Pump will not operate..................● Low process liquid level in the tank. Add liquid.
● Worn or dirty check valves. Clean or replace.
● Blocked discharge line. Clear line.
● Frozen liquid. Thaw liquid throughout pumping system.
● Blown fuse. Replace fuse.
● Open thermal overload device in motor starter. Reset device.
● Broken wire. Locate and repair.
● Low voltage. Investigate and correct (wiring may be too light).
● Pump not primed. Allow suction line and pump head to fill with liquid before
pumping against pressure. Refer to" Filling Pumping System" in Section 3.
● Capacity adjustment set at zero. Readjust capacity.
Insufficient delivery...................... ● Incorrect capacity adjustment. Readjust capacity setting.
● Incorrect pump speed. Match line voltage and frequency to pump motor
data plate.
● Starved suction. Increase piping size or suction head.
● Leaky suction piping. Repair piping.
● High suction lift. Rearrange equipment to decrease lift.
● Liquid near boiling. Cool liquid or increase suction head.
● Leaky safety valve in discharge line. Repair or replace safety valve.
● High liquid viscosity. Reduce viscosity (e g, heat or dilute liquid).
● Worn or dirty check valve seats. Clean or replace.
Erratic delivery.......................... ● Leaky suction piping. Repair piping
● Leaky safety valve. Repair or replace safety valve.
● Insufficient suction head. Raise suction tank level or pressurize tank.
● Liquid near boiling. Cool liquid or increase suction head.
● Worn or dirty check valves. Clean or replace.
● Clogged or dirty line strainer. Clean strainer.
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