TM 9-4120-402-14
Table 5-1. DIRECT SUPPORT TROUBLESHOOTING - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Replace low pressure cutout switch if defective.
Repair or replace if defective.
3. INSUFFICIENT COOLING ACTION.
a. Move MODE selector rotary switch to COOL.
b. Move potentiometer TEMPERATURE control to COOL. If normal cooling does not resume in 15
minutes, go to Step 2.
Step 2.. Check air movement.
a. Remove any obstructions to air flow (evaporator and condenser sides).
NOTE
Frost on the evaporator coil is usually caused by an obstruction to air flow or dirty coils, filter, or
mist eliminator.
Tighten if loose.
Step 4. Check area near condenser coil guard and fresh air intake for heat source over 120F (400C).
Remove heat source.
5-5