Kärcher SSE-503007A Operator's Manual page 16

PROBLEM
RELIEF VALVE
LEAKS OR
SPRAYS OUT
WATER
DETERGENT NOT
DRAWING
MACHINE WILL
NOT DRAW UP
DETERGENT
BURNER MOTOR
WILL NOT RUN
EXCESSIVE
VIBRATION IN
DELIVERY LINE
TEMPERATURE
RELIEF VALVE
LEAKS WATER
(PUMP
PROTECTOR)
BURNER STAYS
ON WHEN SPRAY
GUN IS IN OFF
POSITION
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW
16
TROUBLESHOOTING
POSSIBLE CAUSE
Spray nozzle plugged
Misadjusted or defective relief valve
Scale or dirt plugging inside of coils
Air leak
Detergent metering valve packing not
tight or packing worn
Filter screen on detergent suction hose
plugged
Dried up detergent plugging metering
valve or injector
Restrictor in float tank missing
High viscosity of detergent
Clamps holding detergent lines are loose Tighten clamps.
Hole in detergent line(s)
Strainer basket plugged
Overload protector tripped
Fuel pump seized
Burner fan loose of misaligned
Defective control switch
Loose wire
Defective burner motor
Irregular function of check valves, meter-
ing valves
Spray gun in OFF position with machine
operating for an extended period of time
Relief valve defective
Particle between valve and seat
Fuel pump pressure too high
Flow switch malfunction
Fuel solenoid defective
Pump sucking air
Valves sticking
Unloader valve seat faulty
Nozzle incorrectly sized
Worn piston packing
620-622 • 9.800-187.0 • Rev. 9/10
SOLUTION
Remove nozzle and clean out obstruction.
Adjust or replace as needed.
"See ""Preventative Maintenance Cleaning of
Coil""."
Tighten all clamps. Check detergent lines for holes.
Tighten nut. Replace valve or packing.
Clean or replace.
Clean and flush.
Install restrictor.
Dilute detergent to specifications.
Repair hole.
Remove and clean.
Push reset button.
Replace fuel pump.
Position correctly, tighten set screw.
Replace switch.
Check and replace or tighten wiring.
Replace motor.
Check and replace if necessary.
Open spray gun to cool circulating water.
Replace valve.
Remove internal parts and clean.
Lower fuel pressure to specifications.
Test for continuity and replace as needed.
Replace fuel solenoid.
Check water supply and possibility of air seepage.
Check and clean or replace if necessary.
Check and replace if necessary.
See serial plate for minimum nozzle size.
Check and replace if necessary.