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22 John Deere Operator's Manual
TROUBLESHOOTING
SYMPTOM PROBABLE CAUSE REMEDY
Water flows back into detergent Check valve missing or corroded. Remove, clean or replace.
container.
Water flows from the nozzle when the Trigger gun is malfunctioning. Repair or replace.
trigger gun is locked in the "OFF"
position.
Water is leaking under heat exchanger Coil drain plug is not installed. Install.
coil.
Safety Relief device is relieving 1. Detect and correct unloader or
caused by an unloader or pressure pressure switch problem.
switch malfunction. 2. Replace safety relief device.
NEVER run unit without safety
relief device. Doing so can
cause an explosion!
Burner will not ignite Switch is not in "Burner" Check switch position.
position.
No voltage. Contact Customer Service.
Out of fuel. Refuel. (Reset burner primary
control on cad cell options.)
Fuel pickup screen obstructed. Consult Service.
Trigger gun is closed. Open trigger gun for pressure.
Pressure switch override. Pressure should be over 250 PSI
to allow burner to come on.
High limit switch override. Unit will automatically reignite when
cool.
Flexible coupler broken. Replace.
Dirty or clogged fuel filter/water sep. Drain or replace as necessary.
Fuel pump sucking air. Tighten all fuel intake connections.
Eliminate leaks in intake line.
Fuel pump inoperative. Check pressure, replace if needed.
Dirty or clogged fuel nozzle. Replace.
Improper burner air adjustment. Adjust as explained on page 19.
Ignition transformer failure. Replace.
Ignition electrodes damaged or worn. With unit running and trigger gun
closed, look through burner sight
glass to ensure there is sparking
across electrodes.
Fuel solenoid valve failure. Replace.
High PSI mode. Verify Burner/Steam switch is in
"Burner" mode.
Steam Option: Steam Mode. Verify Burner/Steam switch is in
"Steam" mode.
Steam mode: Pump Head PSI too Reduce pressure to 350PSI.
high.
Cad Cell Option: Primary control lock-out. Reset.