Shark HNG • 9.801-195.0 • Rev. 4/14
PRESSURE
W
ASHER
Tr
oub
leshooting Guide
22
TROUBLESHOOTING
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 system for leaks. Re-tape leaks with
teflon tape.
Faulty or mis-adjusted 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 valve.
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 7 for sizing of gas lines.
Low gas pressure
Increase gas pressure to machine.
Improper pressure regulator
Specify BTU, building gas pressure 11 w.c.i.
to machine for correct sizing of regulator.
Low gas pressure
Increase gas pressure as described on page 8.
Soot buildup on coils not allowing
heat transfer
Clean coils.
Improper burner nozzle
See serial plate
WATER
TEMPERATURE
TOO HOT
Incoming water to machine warm
or hot
Lower incoming water temperature.
Gas pressure too high
See page 10 for specifications for proper gas
pressure.
Detergent line sucking air
Tighten all clamps. Check detergent lines for holes.
Defective high limit switch
Replace.
Incorrect burner nozzle size
See serial plate.
Insufficient water supplied
Check water GPM to machine.
Restricted water flow
Check nozzle for obstruction, proper size.
