9.800-079.0 • Rev. 05/14
17
PRESSURE
W
ASHER
Tr
oub
leshooting Guide
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
DETERGENT NOT
DRAWING
Air is leaking
Tighten all clamps. Check detergent lines for holes.
Injector head may be blocked,
dirty or damaged
Clean and make sure ball and spring behind
detergent hose barb or injector body are working
properly.
Filter screen on detergent
suction hose is plugged
Clean or replace.
Detergent has high viscosity
Dilute detergent to specifications.
Not using soap nozzle
Insert soap nozzle into wand coupler.
Detergent level is low
Add detergent if needed.
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW
ON
INSTALLATION
Pump is sucking air
Check water supply and possibility of air seepage.
Valves are sticking
Check and clean or replace if necessary.
Unloader valve seat is faulty
Check and replace if necessary.
Nozzle sized incorrectly
Check and replace if necessary (see serial plate for
proper size).
Packing piston is worn
Check and replace if necessary.
FLUCTUATING
PRESSURE
Valves are worn
Check and replace if necessary.
Valve has a blockage
Check and replace if necessary.
Pump is sucking air
Check water supply and air seepage at joint in suction
line.
Packing piston is worn
Check and replace if necessary.
PUMP NOISY
Air is in suction line
Check water supply and connections on suction line.
Inlet or discharge valve
springs are weak or broken
Check and replace if necessary.
Excessive matter is in valves
Check and replace if necessary.
Bearings are worn
Check and replace if necessary.
WATER DRIPPING
FROM UNDER
PUMP
Piston packing is worn
Check and replace if necessary.
O-Ring plunger retainer is
worn
Check and replace if necessary.
Piston is cracked
Check and replace if necessary.
Pump protector is worn
Lower water supply pressure. Do not run the spray
gun closed longer than 5 minutes.
OIL DRIPPING
Oil seal is worn
Check and replace if necessary.
EXCESSIVE
VIBRATION IN
DELIVERY LINE
Valves are functioning
irregularly
Check and replace if necessary.
BURNER MOTOR
WILL NOT RUN
Fuel pump has seized
Replace fuel pump.
Burner fan loose or
misaligned
Position correctly and tighten set screw.
Control switch is defective
Replace switch.
There is a loose wire
Check and replace or tighten wiring.
Burner motor is defective
Replace motor.
RELIEF VALVE
LEAKS WATER
Relief valve is defective
Replace or repair relief valve.
