Maintenance
Troubleshooting
PROBLEM
POSSIBLE CAUSE
SOLUTION
LOW OPERATING
PRESSURE
Insufficient water supply
Use larger garden hose; clean filter
washer at water inlet.
Old, worn or incorrect spray nozzle
Match nozzle number to machine and/
or replace with new nozzle.
Plumbing or hose leak
Check plumbing system for leaks. Seal
connections with teflon tape or thread
sealant.
Faulty or mis-adjusted unloader valve
(Where applicable)
Adjust unloader for proper pressure.
Install repair kit when needed.
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 requirements. Obtain a different
power source.
LOW WATER
TEMPERATURE
Improper fuel or water in fuel
Drain fuel tank and replace with proper
fuel.
Low fuel pressure
Increase fuel pressure.
Weak fuel pump
Check fuel pump pressure. Replace
pump if needed.
Fuel filter partially clogged
Replace if needed.
Soot build-up on coils
Clean coils with soot remover.
Lime build-up in coils
Clean inside of coils with coil clean.
Improper burner nozzle
See tank assembly parts list for correct
nozzle.
WATER TEMPERATURE TOO
HOT
Incoming water to machine warm or
hot
Lower incoming water temperature.
Fuel pump pressure too high
Readjust fuel pressure.
Fuel pump defective
Replace fuel pump.
Detergent line sucking air
Tighten all clamps. Check detergent
line for holes.
Defective high limit switch
Replace.
Incorrect fuel nozzle size
See exploded view parts list for proper
size.
Insufficient water supplied
Check GPM to machine.
Restricted water flow
Check nozzle for obstruction and
proper size.
Landa 2HOT Series Operator’s Manual -
9.808-353.0
- A
20
