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21
POWER SYSTEM: ELECTRIC DRIVEN
Problem Probable Cause Remedy
Electric motor does not
start
No electric power Check cord, plug, socket,
and breaker
Thermal overload in the
motor/or starter has been
tripped
Reset manual overload
by depressing the thermal
switch on the outside of the
motor or starter after the
motor has cooled.
CAUTION: Automatic
overload will restart the
motor automatically when it
hascooled.
Power switch inoperative Check power switch
Electric motor or wiring
failure
Replace or repair motor and/
or wiring
No water pressure at inlet Connect to appropriate water
supply
Machine will not auto-start
(if equipped)
Must have adequate water
supply
Check for correct pressure
and gallonage
Coil scale build up Descale coil for better water
flow
Check filter screen and inlet
pressure
Pull trigger gun to check
auto-start function
Pressure switch on unloader
is faulty
Replace
Timer is faulty Remove leads from timer at
control end, see if machine
shuts off after time out,
replace if defective
PUMPING SYSTEM
Problem Probable Cause Remedy
Trigger gun leaks or will
not shut off
Debris in gun valve assembly Clean valve assembly or
replace gun
Pump runs but there is no
spray pressure
Water turned off Turn water on
Nozzle is plugged Clean or replace with proper
size
Inlet chemical injection valve
is open, without the end of
the pickup tube inserted
into detergent. (upstream
injection systems only)
Close soap valve or
submerge detergent pickup
tube into solution
Coil on hot water machines
is obstructed
Clean obstruction or scale
deposits from coil with coil
cleaner
Pump dry, needs to be
primed
Crack open fitting on the
high pressure outlet of the
pump until water flows out
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