Troubleshooting - Landa PHW Operator's Manual

Maintenance

Troubleshooting

PROBLEM
Faulty pressure gauge
Insufficient water supply
Old, worn or incorrect nozzle
Belt slippage
Plumbing or hose leak
Faulty or mis-adjusted unloader valve
LOW OPERATING
PRESSURE
Worn packing in pump
Fouled or dirty inlet or discharge
valves in pump
Worn inlet or discharge valves
Obstruction in spray nozzle
Low power supply
Detergent metering valve left open
sucking air, or faulty metering valve
Little or no fuel
Improper fuel or water in fuel
Plugged fuel filter
Mis-adjusted burner air bands
Little or no fuel pressure from fuel
pump
Faulty burner transformer
BURNER WILL
NOT LIGHT
Disconnected or short in electrical
wiring
Burner motor thermal protector
tripped
Flex-Coupling slipping on fuel pump
shaft or burner motor shaft
ON-OFF switch defective
20
POSSIBLE CAUSE
Landa PHW Operator's Manual 8.917-417.0 - E
SOLUTION
Test with 2nd gauge. If bad, install new gauge.
Use larger garden hose; clean water filter at inlet.
Clean screen inside float tank.
Match nozzle number to machine and/or replace with
new nozzle.
Tighten or replace; use correct belt.
Check plumbing system for leaks. Retape leaks with
teflon tape.
Adjust unloader for proper pressure. Install repair kit
when needed. Test PSI with unloader removed,
taking pressure directly off the pump.
Install new packing kit.
Clean inlet and discharge valves.
Replace with valve kit.
Remove obstruction.
Check voltage of building and compare with require-
ments. Obtain a different power source.
Close and/or replace metering valve.
Fill tank with fuel.
Drain fuel tank and fill with proper fuel.
Replace as needed.
Readjust air bands for clean burn.
Increase fuel pressure to specifications and/or
replace fuel pump.
Test transformer for proper arc between contacts.
Replace as needed.
All wire contacts should be clean and tight. No
breaks in wire.
If tripped, check voltage, connections and exten-
sions for cause. Check fuel pump shaft rotation for
binding causing motor to overheat.
Replace if needed.
Check burner switch for continuity.