TM 9-4120-385-14
Table 3-1. OPERATOR'S TROUBLESHOOTING Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. AIR CONDITIONER NOISY DURING OPERATION
Step 1. Panels loose.
Tighten fasteners. For replacement of defective fasteners, refer to unit
maintenance.
Step 2. Loose components.
Refer to unit maintenance.
3 . INSUFFICIENT COOLING
Step 1. Temperature control knob improperly set.
Set temperature control knob for cooler operation. Refer to Paragraph
Step 2. Refrigerant low or contaminated.
Check sight glass. If refrigerant appears yellow rather than green, or if
bubbles appear in the refrigerant, report the condition to Direct
Support Maintenance.
Step 3. Fan switch set to LO SPEED rather than HI SPEED.
Set fan switch to HI SPEED.
4. NO COOL AIR DISCHARGE
Step 1. Temperature control knob in wrong position.
Step 2. Air filter is dirty or clogged.
Remove and clean air filter. Refer to unit maintenance.
Step 3. HIGH PRESSURE CUT-OUT switch tripped.
RESET HIGH PRESSURE CUT-OUT switch.
3-2