TM 9-4120-404-14
Table 3-3. Unit Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 6. Check for defective logic box assembly.
Test logic board assembly in accordance with paragraph 3-37. If logic box
is defective, replace logic box assembly.
If logic box assembly is not defective, proceed to next step.
Step 7. Check for defective heater cut out switch.
Check heater cut out switch per para. 3-30.
If heater cut out switch defective, replace it. If heater cut out switch is not
defective, proceed to next step.
Step 8. Check for defective light on control panel assembly.
Test each of the control panel lights per para. 3-41.
If control panel lights are not defective, notify your supervisor.
7. ONE CONDENSER FAN MOTOR DOES NOT OPERATE.
WARNING
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
Step 1. Check for loose or damaged connectors or wires.
Tighten or replace loose or damaged connectors, or repair damaged wires.
Step 2. Using Electrical Wiring Diagram Figure 1-6, check electrical connectors and
individual wires for tightness and continuity.
Tighten, repair, or replace as indicated per para. 3-17.
Step 3. Check operation of condenser fan motor.
Test condenser fan motor. Repair or replace as needed per para. 3-34.
3-37
