MasterCraft 312222-01

For parts or assistance, call Mastercraft Customer Service at 1-877-455-5508
PROBLEM POSSIBLE CAUSES
Pump will not prime.  • Notenoughwater.Stopmotor,removepressuregaugebushing,andllcaseandsuction
line with water.
 • Pumpwiredincorrectly.
 • Pluggedventuritubeornozzle.
 • Footvalveissittinginsandormud,orisstuckshut,orleaks.
 • Lowwellwaterlevel.Indeepwells,theejectoraswellasthefootvalvemustbebelow
water level.
 • Forthedeepwellpumps,thediffuserO-ringsealmaybeimproperlypositioned.
 • Airleaks.Checkallconnectionsforairtightness.
Pump delivers water for a
period of time, then stops
pumping.
 • Lowwellwaterlevel.Useawater-leveltesterwhilepumpisoperating.
 • Pluggedventuritube,nozzle,orimpellerparts.
 • Indeepwells,theregulatormaybesetincorrectly.SeeStep14inthe4"diameterDeep
Well Installation Instructions.
Pump does not deliver rated
capacity.
 • Pluggedventuriornozzle.
 • Faultypressuregaugeresultinginfalsereadings.
 • Indeepwells,theoperatingpressuremaybetoohigh.SeeStep14inthe4"diameter
Deep Well Installation Instructions.
 • Lowwellwaterlevel.Useawater-leveltesterwhilepumpisoperating.
 • Forthedeepwellpumps,thediffuserO-ringsealmaybeimproperlypositioned.
 • Oversubmergenceofejector.Indeepwells,ifejectorismorethan10feetbelowpumping
level, pumping capacity is reduced.
 • Indeepwells,theejectormayhaveimpropersizeanddepthsetting.
Motor overheats and shuts off
(overload).
 • Motorvoltagedoesnotmatchpowersupplyvoltage.Seepages2and3.
 • Improperwiresize.SeeWireSizeGuideonpage3.
 • Impellerisrubbingagainstpumpcase.
Pump delivers water but will not
shut off.
 • Impellerneckisworn.
 • Defectivepressureswitch.
 • Forthedeepwellpumps,theO-ringsealmaybeimproperlypositioned.
 • Tankprechargepressuretoohigh.Tankprechargepressuremustbe1–2poundsless
than switch turn-on setting.
 • Indeepwells,thewaterlevelmaybegoingbelowlimitofejector.Usewater-leveltester
while pump is operating.
Pressure switch turns on and
off every few seconds.
 • Galvanizedstoragetankiswaterlogged.
 • Leakyfootvalve.
 • Toomuchtankpressure.
Motor fails or does not operate
properly.
 • IfwithinWarranty,returnpump/motorunittoplaceofpurchase(withproofofpurchase)
for exchange.
Troubleshooting 10
TROUBLESHOOTING CHECKLIST (CAUTION: SHUT OFF POWER TO PUMP)