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Part Number STH14 9/10 129
PUMP
Problem Possible Cause Correction
Pump motor does
not pump
Black and/or red
probe shorted
Remove probes and bend
straight or replace with new
probe(s).
Problem with motor
or motor wiring
Check line voltage first. Check
AC voltage across load
terminals on Liquid Level
Control. If voltage is 120 plus or
minus 10%, replace motor or
motor wiring.
Problem with Liquid
Level Control Board
Check line voltage first. If AC
voltage across load terminals is
not 120 plus or minus 10%,
replace the Liquid Level Control
Board.
Water pressure from
water source is not
high enough
Verify water pressure leading
into pump inlet is 40 psi
minimum with pump running.
Pump will not run
but tank appears to
be always full
Common Lead
(Green) shorted out
to Red wire (High
Probe)
Verify Green and Red wires are
not touching.
Pump will not run
but tank level
appears to be
below start level
Common Lead
(Green) shorted out
to Black wire (Low
Probe)
Verify Green and Black wires
are not touching.
Pump motor does
not shut off
Problem with Liquid
Level Control Board
Short the “H & L” terminals on
the Liquid Level Control Board.
If motor does not shut off,
replace Liquid Level Control
Board.
Probe Harness
Connection may be
open
Verify connections are good or
replace the wiring harness.
Water may not be
reaching top probe in
carb tank
Verify tank is not filled with CO
2
or air by pulling relief valve up
and letting air escape until water
begins coming out.
High Lead (Red)
open or not
connected
Verify Red lead wire is
connected from tank to unit.
Common lead
(Green) open or not
connected
Verify Green lead wire is
connected from tank to unit.
Pump motor
intermittent
Problem with probe
or probe harness
Check motor and motor wires by
removing red and black wires
from the Liquid Level Control
Board. If okay, short “H & L”
terminal on Liquid Level Control
Board. If motor stays off, verify
probes and bend straight or
replace. Verify with meter.
Problem with motor
or motor wiring
Measure AC voltage across
load terminals on Liquid Level
Control Board. If line voltage is
120 plus or minus 10% replace
motor or motor wiring.
Pump motor
intermittent
Problem with Liquid
Level Control Board
Check line voltage first. If AC
voltage across load terminals on
Liquid Level Control Board is
not 120 plus or minus 10%,
replace the Liquid Level Control
board.
STH14.book Page 129 Thursday, September 23, 2010 3:35 PM
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