Troubleshooting - Landa MVC3-30321 Operator's Manual

MVC SERIES PRESSURE WASHER
PROBLEM
LOW OPERATING
PRESSURE
BURNER WILL NOT
LIGHT

TROUBLESHOOTING

POSSIBLE CAUSE
Water supply is insufficient
Spray nozzle is old, worn or incorrect
Belt slips
Plumbing or hose is leaking
Unloader is faulty or misadjusted
Packing in pump is worn
Discharge valve in pump or inlet is
fouled or dirty
Discharge valve or inlet is worn
Spray nozzle has obstruction
Steam pressure control valve is
leaking (where applicable)
Engine RPM is slow
There is little or no fuel
Improper fuel or water in fuel
Fuel line is clogged
Fuel filter is plugged
Burner air bands are misadjusted
Little or no fuel pressure from fuel
pump
Burner transformer is faulty
Electrical wiring is disconnected or
has short in it
Flex coupling is slipping on fuel pump
shaft or burner motor shaft
ON-OFF switch is defective
Heavy sooting on coil and burner can
cause interruption of air flow and
shorting of electrodes
Electrode setting is improper
30 amp circuit breaker tripped
Bridge rectifier defective
12V DC relay defective
Fuel is not reaching combustion
chamber
LANDA MVC • #96-61836 • REV. 5/03
OPERATOR'S MANUAL
SOLUTION
Use larger supply hose; clean filter at water
inlet.
Match the nozzle number to the machine
and/or replace with new nozzle.
Tighten or replace belt; use correct belt.
Check plumbing system for leaks. Retape
leaks with teflon tape.
Adjust unloader for proper pressure. Install
repair kit when necessary or replace.
Install new packing kit.
Check inlet and discharge valve.
Replace with valve kit.
Remove obstruction.
Rebuild or replace as necessary.
Set engine speed at proper specifications. See
serial plate.
Fill tank with fuel.
Drain fuel tank and fill with proper fuel.
Clean or replace fuel line.
Replace fuel filter as needed.
Readjust air bands for clean burn.
Increase fuel pressure to specification and/or
replace fuel pump.
Test transformer for proper arc between
contacts. Replace as needed.
All wire contacts should be clean and tight
with no breaks in wire.
Replace if needed.
Check for electrical current reaching burner
assembly with burner switch on. Replace switch
if needed.
Clean as required.
Check and reset according to diagram in
manual.
Push in reset button.
Test and replace.
Test and replace.
Check fuel pump for proper flow. Check
solenoid flow switch on machines with spray
gun control for proper on-off flow control.
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