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one at a time and check 

operation with an ohmmeter 

by manually raising and 

lowering the float.

3.  Pump runs but red run light 

does not energize.

a. Check the run light.

b. Check for loose wire at light 

or in panel.

4.  Pump runs but does not 

pump down the wet well.

a. Pump rotation may be 

wrong. Wiring of pump 

to control panel may be 

reverse sequenced.

b. Impeller may be dragging 

in volute due to solids. 

High ampere draw would 

identify this.

c. Refer to the pump manual 

for other possibilities such 

as closed discharge gate 

valve, etc.

5.  Severe humming/

chattering of contactors 

and control relays.

a. There may be low voltage. 

Check voltage at primary 

and secondary of control 

transformer by using 

a voltmeter. 

   This low voltage condition 

may even cause severe  

chattering and burn-up of 

relays. The utility needs to 

increase voltage.

b. Contactor may have dust 

around magnet of coil 

structure. Clean and/or dry 

as required.

c. Check voltage to the control 

panel. Contactors require 

a minimum of 85% of full 

voltage to pull in without 

chatter. If the problem is 

a chronic one, measure 

voltage with recorder on a 

24 hour basis.

d. Make sure floats are located 

away from any turbulence.

4

e. Dry out the junction box 

(if furnished); moisture in 

the junction box will tend 

to cause the intrinsically 

safe relays to energize 

intermittently.

6.  Nuisance tripping of 

overload on motor starters 

or circuit breakers.

a. Check all reset buttons and 

tripped breakers.

b. Check pump amp draw with 

amprobe and compare to 

nameplate amps on pump.

c. The impeller may be locked 

up due to excessive debris 

or solids.

d. Possible motor failure (fault 

on windings).

e. Pump may be miswired to 

terminal block.

7.  Short cycling pump.

a. Check float controls.

8.  Run light stays on.

a. Selector switch may be in 

the Hand position.

9.  Red seal failure light 

comes on.

a. Pump seal has failed and 

allowed contaminant 

to enter pump housing. 

Refer to pump manual for 

appropriate action.

10.Test for blown fuse.

a. With main power turned 

off, check fuses with 

V-O-M set on ohm scale.

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