VNG/VLP SERIES PRESSURE WASHER
OPERATOR’S MANUAL
37
PROBLEM
POSSIBLE CAUSE
SOLUTION
LOW OPERATING
PRESSURE
Faulty pressure gauge
Install new gauge.
Insufficient water supply
Use larger garden hose; clean filter washer at water
inlet.
Old, worn or incorrect spray
nozzle
Match nozzle number to machine and/or replace
with new nozzle.
Belt slippage
Tighten or replace; use correct belt.
Plumbing or hose leak
Check plumbing.
Faulty or misadjusted unloader
valve (where applicable)
Adjust unloader for proper pressure. Install repair kit
when needed.
Worn packing in pump
Install new packing kit.
Fouled or dirty inlet or discharge
valves in pump
Clean inlet and discharge valves.
Worn inlet or discharge valves
Replace with valve kit.
Obstruction in spray nozzle
Remove obstruction.
Leaking pressure control valve
(where applicable)
Rebuild or replace as needed.
Detergent metering valve left
open sucking air, or faulty
metering valve
Close and/or replace metering valve.
Slow motor RPM
Check incoming voltage.
LOW WATER
TEMPERATURE
Improper size of gas lines
See page 8 for sizing of gas lines.
Low gas pressure
Increase gas pressure to machine.
Improper pressure regulator
Specify BTU, building gas pressure and 11" wc to
machine for correct sizing of regulator.
Low gas valve pressure
Increase gas pressure as described on pages 13-14.
Soot buildup on coils not
allowing heat transfer
Clean coils.
Improper burner nozzle
See exploded view parts list.
TROUBLESHOOTING
