38
VNG/VLP SERIES PRESSURE WASHER
OPERATOR’S MANUAL
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
WATER
TEMPERATURE
TOO HOT
Incoming water to machine warm or hot
Lower incoming water temperature.
Gas pressure too high
Call local gas company.
Detergent line sucking air
Tighten all clamps Check detergent lines for
holes.
Defective high limit switch
Replace.
Incorrect burner nozzle size
See exploded view parts list.
Insufficient water supplied
Check water G.P.M. to machine.
Restricted water flow
Check nozzle for obstruction, proper size.
DETERGENT NOT
DRAWING
Air leak
Tighten all clamps. Check detergent lines for
holes.
Detergent metering valve packing not
tight or packing worn
Tighten nut. Replace valve or packing.
Filter screen on detergent suction hose
plugged
Clean or replace.
Dried up detergent plugging metering
valve
Disassemble and clean thoroughly.
High viscosity of detergent
Dilute detergent to specifications.
Restriction behind float tank screen
removed
Install restriction.
Hole in detergent line(s)
Repair hole.
Strainer basket plugged
Remove and clean.
Connections on selector valve loose
Put teflon tape on all pipe connections.
Detergent solenoid not opening (where
applicable)
Check flow switch, replace detergent
solenoid.
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW ON
INSTALLATION
Pump sucking air
Check water supply and possibility of air
seepage.
Valves sticking
Check and clean or replace if necessary.
Unloader valve seat faulty
Check and replace if necessary.
Nozzle incorrectly sized
Check and replace if necessary (see serial
plate for proper size).
Worn piston packing
Check and replace if necessary.
