Landa VHG, Operator'S Manual, Page: 34 / 38

34
Troubleshooting
PROBLEM POSSIBLE CAUSE SOLUTION
WATER
TEMPERATURE
TOO HOT
Incoming water to machine warm or hot Lower incoming water temperature.
Gas pressure too high See specifications for proper gas pressure.
Detergent line sucking air
Tighten all clamps. Check detergent lines for
holes.
Defective high limit switch Replace.
Incorrect burner nozzle size See serial plate.
Insufficient water supplied Check water GPM to machine.
Restricted water flow Check nozzle for obstruction, proper size.
PRESENCE OF
WATER IN OIL
Oil seal worn Check and replace if necessary.
High humidity in air Check and change oil twice as often.
WATER DRIPPING
FROM UNDER
PUMP
Piston packing worn Check and replace if necessary.
O-Ring plunger retainer worn Check and replace if necessary.
DETERGENT
NOT DRAWING
Air leakTighten all clamps. Check detergent lines for holes.
Detergent metering valve packing not tight or
packing worn
Tighten nut. Replace valve or packing.
Filter screen on detergent suction hose
plugged
Clean or replace.
Dried up detergent plugging metering valve Disassemble and clean thoroughly.
High viscosity of detergent Dilute detergent to specifications.
Restriction behind float tank screen
removed
Install restriction.
Hole in detergent line(s) Repair hole.
Strainer basket plugged Remove and clean.
Connections on selector valve loose Put teflon tape on all pipe connections.
Detergent solenoid not opening
(where applicable) Check flow switch, replace detergent
solenoid.
PUMP
RUNNING
NORMALLY
BUT PRESSURE
LOW ON
INSTALLATION
Pump sucking air Check water supply and possibility of air.
Valves sticking Check and clean or replace if necessary.
Unloader valve seat faulty Check and replace if necessary.
Nozzle incorrectly sized
Check and replace if necessary
(See serial plate for proper size).
Worn piston packing Check and replace if necessary.
FLUCTUATING
PRESSURE
Valves worn Check and replace if necessary.
Blockage in valve Check and replace if necessary.
Pump sucking air
Check water supply and air seepage at joints
in suction line.
Worn piston packing Check and replace if necessary.
PUMP NOISY
Air in suction line
Check water supply and connections on
suction line.
Broken or weak inlet or discharge valve
springs
Check and replace if necessary.
Excessive matter in valves Check and clean if necessary.
Worn bearings Check and replace if necessary.
Landa VHG Operator’s Manual 8.913-952.0 - BR