Section II TROUBLESHOOTING PROCEDURES

TM 5-4120-393-14

3-2. Use of Table. Table 3-1 contains operator troubleshooting information designed to be useful in diagnosing and

correcting common malfunctions which may develop in the air conditioner.

a. The table lists the common malfunctions which you may find during the operation or maintenance of the air

conditioner or its components. You should perform the tests/inspections and corrective actions in the order listed.

b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a

malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.

Table 3-1. Operator Troubleshooting

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. AIR CONDITIONER DOES NOT START IN ANY MODE.

Step 1. Check to see if input power has been disconnected.

Connect input power.

Step 2. Check to see if circuit breaker is tripped.

Pull then push circuit breaker reset knob.

NOTE

If circuit breaker continues to trip, contact unit maintenance.

2. AIR CONDITIONER STARTS BUT DOES NOT COOL.

Step 1. Check that mode selector switch is set to COOL and TEMPerature control thermostat is set to

DECREASE.

Set mode selector switch to COOL and properly adjust TEMPerature control

thermostat.

3-2