TROUBLESHOOTING TABLES.

TM 5-4120-386-14

3-4. TROUBLESHOOTING TABLES.

Table 3-1. Operator

Troubleshooting.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. AIR CONDITIONER FAILS TO OPERATE.

Verify that power cable is connected to proper voltage,

Step 1.

Connect power cable to receptacle.

Step 2. Check to be sure that control or compressor circuit breaker is ON.

Reset circuit breaker.

Make sure that mode selector switch is not in OFF position.

Step 3.

Turn selector knob to desired operation.

Step 4. Check that high and low pressure switches have been reset.

Reset pressure switches and wait for compressor to start.

2. INSUFFICIENT COOLING.

Step 1.

Check to be sure that mode selector switch is properly positioned.

Set switch to COOL.

Make sure that temperature switch is set correctly.

Step 2.

Adjust setting to COOLER.

Determine that sufficient air is passing across evaporator coil by

Step 3.

placing a piece of paper in front of the evaporator inlet louver. The

paper should be held against the louver blades by the air.

Open evaporator inlet louver blades. Remove any obstructions

from evaporator inlet and outlet louvers.

Make sure that there is not too much outside air entering unit.

Step 4.

Close or adjust damper door.

3-2