Section II. OPERATOR TROUBLESHOOTING

TM 5-4120-374-13

Section II. OPERATOR TROUBLESHOOTING

3-2. G E N E R A L

a. This section provides information useful in diagnosing and correcting unsatisfactory operation or failure

of the air conditioner. Each malfunction is followed-by a list of probable causes and actions to take to remedy

the malfunction. 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.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE

ACTION

AIR CONDITIONER

1. AIR CONDITIONER FAILS TO OPERATE.

Step 1. Check to see if main power cord is plugged in,

Connect power cable to receptacle supplying 115 VAC, single phase, 60 Hz power.

Step 2. Check to see if selector switch is in OFF position.

Place selector switch in FAN or COOL position.

2. INSUFFICIENT COOLING

Step 1. Check to see if selector switch is in COOL position.

Place selector switch in COOL position.

Step 2. Check to see if THERMOSTAT is in COOLER position.

Place THERMOSTAT in COOLER position.

Step 3. Inspect air diffuser and return air grills for obstructions.

Remove obstructions from air diffuser and return air grills (para 3-5).