John Deere WASHERS AC-3500GHH - Manual (Page 19)

John Deere Operator's Manual 19
TROUBLESHOOTING
SYMPTOM PROBABLE CAUSE REMEDY
Water is leaking under heat Coil drain plug is not installed. Install.
exchanger coil.
Safety relief device is relieving 1. Detect and correct unloader or
caused by an unloader or pressure pressure switch problem.
switch problem. 2. Replace safety relief device.
NEVER run unit without safety
relief device. Doing so can cause
an explosion!
Burner will not ignite Burner switch is not turned on. Check switch position.
Out of fuel. Refuel.
Trigger gun is closed. Open trigger gun for pressure.
EMF Drive belt loose or broken. Adjust or replace as necessary.
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.
Fuel pickup screen is obstructed. Consult Service.
Dirty or clogged fuel nozzle. Replace fuel nozzle.
Ignition module. Consult Service.
Ignition electrodes damaged or worn. With unit running and trigger gun
closed, look through burner sight
glass to ensure there is sparking
across electrodes.
No voltage. Consult Service.
Pressure switch override. Pressure should be over 250 PSI/
18 Bar to allow burner to come on.
High limit switch override. Allow unit to cool down before
reigniting.
Improper burner air adjustment. Adjust as shown on page 18.
Fuel solenoid valve failure. Replace.
Burner runs erratically. Water in the fuel oil. Drain fuel filter/water separator,
drain fuel tank and replace with
clean fuel.
Dirty fuel filter/water separator. Replace element.
Dirty fuel nozzle. Replace.
Improper air adjustment setting. Adjust as shown on page 18.
Fuel pickup screen is obstructed. Consult Service.
Fuel pump malfunctioning. Replace.
Burner runs, but will not heat. Poor or improper fuel supply. Check fuel to ensure it is correct.
Drain tank and filter if necessary
and refill with proper fuel.
Low fuel pump pressure. Check fuel pump pressure, replace
if needed.
Dirty fuel nozzle. Replace.
Improper air adjustment setting. Adjust as shown on page 18.
Fuel pickup screen is obstructed. Consult Service.
Scale build up in heat exchanger coil. Consult Service.
Burner discharges white smoke. Low on fuel. Refuel. If white smoke persists,
consult Service.
Excessive air supply. Adjust as shown on page 18.
Burner discharges black smoke. Insufficient air supply. Adjust as shown on page 18.