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.
