Wacker Neuson HI 400 HD D, Operator'S Manual, Page: 61 / 68

HI 400HD D / HD G Basic Troubleshooting
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8 Basic Troubleshooting
Note: The following symptoms and remedies are some of the more
common issues that have arisen during the history of these machines.
These do not represent all the possibilities. If you need advanced
troubleshooting assistance, please contact Wacker Neuson Product
Support.
Note:
Symptom Possible Causes Remedy
The burner does not start
• The remote thermostat or
thermostat plug is not
inserted correctly.
• Faulty cable or power
supply
• The over temperature limit
has tripped
• The burner is in lock-out
mode.
• Insert the remote
thermostat or thermostat
plug.
• Check cable and power
supply
• Press the reset button.
The burner starts, the flame
does not ignite, the unit locks
out
• No fuel
• Worn burner nozzle
• Faulty electrodes
• Cad cell detecting external
light.
• Cad cell defective
• Burner control defective
• Fill fuel tank
• Replace burner nozzle
• Replace electrodes
• Check the Cad cell
enclosure
The burner starts, flame
ignites, but the unit locks out
• Incorrect fuel pressure
• Worn burner nozzle
• Incorrect air lock setting
• Cad cell defective
• Burner control defective • Increase fuel pressure
• Replace burner nozzle
• Re-adjust air lock setting
The burner ignites but the
performance is poor
• Worn burner nozzle
• Clogged fuel filter
• Air leaks in the fuel lines
• Insufficient oil pressure
• Replace burner nozzle
• Replace the fuel filter
• Inspect the lines for leaks;
replace if necessary
Black smoke from vent pipe
• Insufficient combustion air
• Insufficient ventilation air • Remove any obstructions
from the air inlet and outlet
areas.
The machine stops due to
pressure switch fault
• Overheat condition
• Faulty pressure switch
• Incorrect nozzle
• Wrong fuel pressure • Contact Wacker Neuson
Product Support