9.803-436.0-B • Operator Kärcher HDS Diesel
15
PRESSURE
W
ASHER
T
roub
leshooting Guide
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
LOW WATER
TEMPERATURE
Improper fuel or water in fuel
Replace with clean and proper fuel.
Low fuel pressure
Increase fuel pressure.
Weak fuel pump
Check fuel pump pressure. Replace pump if
needed.
Fuel fi lter partially clogged
Replace as needed.
Soot build-up on coils not allowing
heat transfer
Clean coils.
Improper burner nozzle
Call Dealer.
WATER
TEMPERATURE
TOO HOT
Incoming water to machine warm or
hot
Lower incoming water temperature.
Fuel pump pressure too high
See specifi cations for proper fuel pressure.
Fuel pump defective
Replace fuel pump.
Detergent line sucking air
Tighten all clamps. Check detergent lines for
holes.
Defective temperature switch
Replace.
Incorrect fuel nozzle size
Call Dealer.
Insuffi cient water supplied
Check water G.P.M. to machine.
Restricted water fl ow
Check nozzle for obstruction, proper size.
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.
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.
Cracked piston
Check and replace if necessary.
Pump protector
Lower water supply pressure. Do not run with
spray gun closed longer than 2 minutes.
