Landa PDHW5-35624E Service Manual page 13

PROBLEM
OIL DRIPPING
EXCESSIVE VIBRATION
IN DELIVERY LINE
DETERGENT
NOT DRAWING
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW
ON INSTALLATION
BURNER MOTOR
WILL NOT RUN
RELIEF VALVE
LEAKS WATER
POSSIBLE CAUSE
Oil seal worn
Irregular functioning of the valves
Air leak
Restrictor in float tank is missing
Filter screen on detergent suction hose
plugged
Dried up detergent plugging metering
valve
High viscosity of detergent
Hole in detergent line(s)
Low detergent level
Pump sucking air
Valves sticking
Nozzle incorrectly sized
Unloader valve seat faulty
Worn piston packing
Fuel pump seized
Burner fan loose or misaligned
Defective control switch
Loose wire
Defective burner motor
Relief valve defective
Landa PDHW Service Manual 8.920-098.0 - AU
SOLUTION
Check and replace if necessary.
Check and replace if necessary.
Tighten all clamps. Check detergent lines
for holes.
Replace restricter. Check for proper orifice
in restrictor.
Clean or replace.
Disassemble and clean thoroughly
Dilute detergent to specifications.
Repair hole.
Add detergent, if needed.
Check water supply and possibility
of air seepage.
Check and clean or replace if necessary.
Check and replace if necessary
(See serial plate for proper size).
Check and replace if necessary.
Check and replace if necessary.
Replace fuel pump.
Position correctly, tighten set screw.
Replace switch.
Check and replace or tighten wiring.
Replace motor.
Replace or repair.
Maintenance
13