Landa SEHW6-3500, Operator'S Manual, Page: 11 / 38

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
11
PRESSURE
W
ASHER
Tr
oub
leshooting Guide
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
LOW
OPERATING
PRESSURE
Faulty pressure gauge Test with 2nd gauge. If bad install new gauge.
Insufficient water supply Use larger garden hose; clean water filter at
inlet. Clean screen inside float tank.
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. Retape
leaks with teflon tape.
Faulty or mis-adjusted unloader valve
(Where applicable)
Adjust unloader for proper pressure. Install
repair kit when needed. Test PSI with unloader
removed, taking pressure directly off the pump.
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.
Low power supply Check voltage of building and compare with
requirements. Obtain a different power source.
Detergent metering valve left open
sucking air, or faulty metering valve
Close and/or replace metering valve.
BURNER WILL
NOT LIGHT
Little or no fuel Fill tank with fuel.
Improper fuel or water in fuel Drain fuel tank and fill with proper fuel.
Plugged fuel filter Replace as needed.
Misadjusted burner air bands Readjust air bands for clean burn.
Little or no fuel pressure from fuel pump Increase fuel pressure to specification on fuel
pump and/or replace fuel pump.
Faulty burner transformer Test transformer for proper arc between
contacts. Replace as needed.
Disconnected or short in electrical
wiring
All wire contacts should be clean and tight.
No breaks in wire.
Burner motor thermal protector tripped If tripped, check voltage, connections, and
extensions for cause. Check fuel pump shaft
rotation for binding causing motor to overheat.
Flex-coupling slipping on fuel pump
shaft or burner motor shaft
Replace if needed.
On-Off switch defective Check continuity through burner switch.
Heavy sooting on coil and burner, can
cause interruption of air flow and
shorting of electrodes
Clean as required.
Improper electrode setting Clean and set according to
diagram in Operators Manual.
Fuel not reaching combustion chamber Check fuel pump for proper flow. Check
solenoid flow switch on units with spray gun
control, for proper on-off fuel flow control.
Clogged burner nozzle Replace.
Water not flowing through unloader Open spray gun to allow water to flow.
Flow switch malfunction Remove test for continuity and replace as
needed.
Fuel solenoid malfunction Replace if needed