20
Maintenance
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 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
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.
Obstruction in spray nozzle Remove obstruction.
Low power supply
Check voltage of building and compare with require-
ments. 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.
Mis-adjusted burner air bands Readjust air bands for clean burn.
Little or no fuel pressure from fuel
pump
Increase fuel pressure to specifications 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 exten-
sions 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 burner switch for continuity.
Troubleshooting
Landa PHW Operator’s Manual 8.917-417.0 - D
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