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24
HEATING BURNER SYSTEM – DIESEL FIRED
Problem Probable Cause Remedy
Burner will not fire, plus
diesel fumes are emitted
from the exhaust port
WARNING: Replace
insulation. Unburned fuel
can saturate it and cause
afire.
Fuel to air ratio out of
adjustment
Set air band and fuel
pressure to specifictions
Fuel nozzle partially clogged Replace nozzle of proper
size
Ignition transformer not
providing spark to fuel
Replace ignition transformer,
clean and adjust electrodes
Burner fires and smokes Fuel to air ratio out of
adjustment
Set air band and fuel
pressure to specifictions
Excessive soot on coils Clean soot off to improve
air flow
Improper voltage at burner Adjust RPM of generator (if
equipped)
Discharge water
temperature exceeds
recommended operating
temperature
Burner input too high for
conditions
Decrease fuel pump pressure
and/or fuel nozzle size
Water flow restricted Clean or replace nozzle of
proper size. Descale coil and
clear obstructions
High temperature limit switch
faulty or set too high
Replace or reset temperature
limit switch
Burner continues to fire
even when trigger on spray
gun is released
Faulty Flow, Pressure or
Vacuum switch
Replace switch
Faulty fuel solenoid Replace solenoid
Discharge water
temperature not reaching
maximum operating
temperature
Burner input too low for
conditions
Increase fuel pump pressure
and/or fuel nozzle size
Battery keeps losing
voltage (For 12 volt burner
systems)
Battery voltage Low Have battery checked and
load test, charge if low and
replace if necessary. Allow
water to cool 2 minutes
before shutting off engine
RPM too low Engine RPM should be 3600
RPM w/no load
Engine charging system
faulty
Check engine charging
system – Must have 16 Amp
output minimum
Electrodes misadjusted Adjust electrodes to
maximum 1/8" gap
Fuel pump pressure too high Fuel pump pressure should
be approximately 100 to 140
PSI
Air band open too far Adjust for proper burn
Burner amp draw too high Check amp draw of burner
motor – should be 13 amp
or less. Check amp draw of
transformer should be 4.2
or less
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