TM 9-4120-357-14
Table 3-1. Troubleshooting (Cont')
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 1. Check mode selector switch for proper setting.
Set switch at COOL.
Step 2 . Verify that low- or high-pressure cutout switches have not tripped.
Press and release cutout switch reset buttons.
3. COMPRESSOR STARTS NORMALLY, BUT STOPS ON OVERLOAD.
Step 1. Check evaporator intake and discharge grilles to be sure they are open and
unobstructed.
Open grilles or remove obstructions.
Step 2. Check deflector door and air conditioner to be sure that they are open.
Open deflector door and air conditioner cover.
Step 3. Check condenser air inlet screen for dirt or obstruction.
Clean condenser air inlet screen or remove obstruction.
4. REDUCED COOLING CAPACITY.
Step 1. Check temperature control thermostat setting.
Set thermostat at maximum DECREASE.
Step 2. Check fresh air damper to be sure that it is not admitting too much hot, humid air.
Adjust fresh air damper.
Step 3. Check for open doors, windows or operating exhaust fans in conditioned area.
Close doors and windows. Turn off or reduce speed of exhaust fans.
Step 4. Verify that evaporator intake and discharge grilles are properly adjusted (open).
Adjust grilles correctly.
Step 5. Make sure that deflector door is open, and that air conditioner cover is rolled up and
stowed.
Open deflector door and air conditioner cover.
Step 6. Check condenser intake screen for dirt or obstruction.
Clean screen or remove obstruction.
Step 7. Make sure that all cover plates and panels are in position and are sealing the lower casing.
Cover and seal any non-functional openings.
3-2