Table 4-2. Organizational Maintenance Troubleshooting - Continued
TESTING OR INSPECTION
7 - Continued
Check wiring to combustion motor. Inspect wiring from terminal strip to motor.
Tighten loose connections, or replace broken wires.
Check for exhaust system obstructions. Inspect exhaust line for blockage, kinks, or bends which
could restrict the flow of exhaust gases from the heat exchanger.
Exhaust lines are not supplied with the heater. Clean out, repair, or replace defective pipe or
tube as applicable.
Check for correct fuel adjustment.
Adjust fuel needle as follows:
Start the heater and allow it to warm up for a few minutes.
Open the front access door and turn the fuel needle clockwise gently until it is seated in the
Do not force the fuel needle. This may damage the fuel orifice and make correct
adjustment difficult or impossible.
Turn the needle counterclockwise in 1/8 turn increments. After each increment, inspect the
exhaust. The fuel flow should be increased until there is no odor of unburned fuel or any smoke.
Check combustion air duct. Inspect for loose or damaged air duct.