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John Deere Operator's Manual 21
TROUBLESHOOTING
SYMPTOM PROBABLE CAUSE REMEDY
Pump motor will not run. Circuit overload. Check wall breaker or fuse.
GFCI tripped. Reset.
Motor overload. Reset thermal overload button on
pump motor or inside electrical
control panel.
Auto Start/Stop Option in use. Point gun in a safe direction an
squeeze trigger.
No discharge at nozzle when Inadequate water supply. Ensure hose is 3/4" diameter and
trigger mechanism is squeezed. incoming water supply is turned on.
Low or fluctuating pressure. Kink in water inlet hose. Remove kink.
Kink in high pressure discharge hose. Replace kinked high pressure hose.
Water inlet screen obstructed. Remove screen, clean or replace.
Pump sucking air. (Prime eliminated) Tighten all water intake connections
Eliminate leaks in intake line.
Adjustable Grip on Dual Lance Turn grip counterclockwise to move
is not in high pressure mode. to high pressure.
Obstructed or worn spray nozzle. Remove, clean or replace.
Damaged or obstructed valve assy. Remove, clean or replace.
on pump.
Pump packings worn. Replace packings.
Unloader/Bypass valve not operating Repair or replace.
correctly.
Scale build-up in heat exchanger coil. Descale coil.
Water is leaking from Heat DumpValve. Water inlet temperature is too high. Incoming water temperature must be
less than 125°.
Water temperature is too high. Do not allow unit to operate in
bypass mode (with the trigger gun
closed) for more than three minutes.
Defective valve. Replace.
Oil appears milky or foamy. Water in oil. Change pump oil. Fill to proper
level.
Oil leaking from unit. Worn seals or o-rings. Contact Customer Service.
Detergent will not siphon . Detergent strainer is not completely Check, submerge if necessary.
submerged in detergent solution.
Detergent strainer obstructed. Inspect, clean or replace.
Detergent hose cut, obstructed or Inspect, clean or replace.
kinked.
Detergent adjusting knob turned to Open adjusting knob. Refer to
closed position. "Cleaning with Detergents" pg. 18.