9.800-079.0 • Rev. 05/14
15
PRESSURE
W
ASHER
Tr
oub
leshooting Guide
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
LOW OPERATING
PRESSURE
Water supply is insufficient
Use larger supply hose; clean filter at water
inlet.
Spray nozzle is old, worn or
incorrect
Match the nozzle number to the machine
and/or replace with new nozzle.
Belt slips
Tighten or replace belt; use correct belt.
Plumbing or hose is leaking
Check plumbing system for leaks. Retape
leaks with teflon tape.
Unloader is faulty or misadjusted
Adjust unloader for proper pressure. Install
repair kit when necessary or replace.
Packing in pump is worn
Install new packing kit.
Discharge valve in pump or inlet is
fouled or dirty
Check inlet and discharge valve.
Discharge valve or inlet is worn
Replace with valve kit.
Spray nozzle has obstruction
Remove obstruction.
Steam pressure control valve is
leaking (where applicable)
Rebuild or replace as necessary.
Engine RPM is slow
Set engine speed at proper specifications /
see serial plate.
BURNER WILL
NOT LIGHT
There is little or no fuel
Fill tank with fuel.
Improper fuel or water in fuel
Drain fuel tank and fill with proper fuel.
Fuel line is clogged
Clean or replace fuel line.
Fuel filter is plugged
Replace fuel filter as needed.
Burner air bands are misadjusted
Readjust air bands for clean burn.
Little or no fuel pressure from fuel
pump
Increase fuel pressure to specification and/or
replace fuel pump.
Burner transformer is faulty
Test transformer for proper arc between
contacts. Replace as needed.
Electrical wiring is disconnected or
has short in it
All wire contacts should be clean and tight
with no breaks in wire.
Flex coupling is slipping on fuel
pump shaft or burner motor shaft
Replace if needed.
ON-OFF switch is defective
Check for electrical current reaching burner
assembly with burner switch on. Replace
switch if needed.
Heavy sooting on coil and burner
can cause interruption of air flow and
shorting of electrodes
Clean as required.
Electrode setting is improper
Check and reset according to diagram in
manual.
25 amp circuit breaker tripped
Push in reset button.
Bridge rectifier defective
Test and replace.
12V DC relay defective
Test and replace.
Fuel is not reaching combustion
chamber
Check fuel pump for proper flow. Check
solenoid flow switch on machines with spray
gun control for proper on-off flow control.
