EVAPORATOR AIR OUTPUT VOLUME LOW

TM 5-4120-352-14

Table 4-2. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

6. EVAPORATOR AIR OUTPUT VOLUME LOW

Step 1. Check to see if evaporator fan speed switch is set at low speed.

Reset switch to HIGH speed.

Step 2. Check for dirty or damaged filter or louvers.

Clean or replace filter (para 4-17). Clean or replace louvers, as required (para 4-18).

Step 3. Check for iced or dirty evaporator coil.

De-ice and clean coil (para 4-24).

Step 4. Inspect evaporator fan for defect.

Replace defective fan.

Step 5. Test fan motor for faulty operation.

Replace motor (para 4-38 and 4-40).

7. CONDENSER AIR OUTPUT VOLUME LOW

Step 1. Check for dirty condenser coil or guard.

Clean coil and guard (para 4-23).

Step 2. Check to see if air outlet louvers are stuck in closed position.

Free louvers and control cable. Adjust control, or notify direct support maintenance if actuating cylin-

der is not functioning properly.

Step 3. Check for defective HIGH-LOW condenser fan thermostatic switch.

Replace switch (para 4-41).

Step 4. Inspect for defective condenser fan.

Replace fan.

Step 5. Test for defective fan motor.

Replace motor (para 4-38 and 4-40).

8. AIR CONDITIONER FAILS TO HEAT

Step 1. Check to see if mode selector switch is improperly adjusted.

Reset selector to LOW heat or HIGH heat.

Step 2. Check to see if temperature selector control is act incorrectly.

Adjust control to WARMER.

Step 3. Inspect evaporator return air filter for dirty condition.

Clean filter (para 4-17).

Step 4. Inspect for defective temperature selector switch or mode selector switch.

Replace defective switch (para 4-42).

Step 5. Inspect for defective heater high temperature cutout thermostatic switch.

Replace defective thermostatic switch (para 4-34).

Test for defective heater relay.

Step 6.

Replace defective relay (para 4-43).

Step 7. Inspect and test for defective heaters and associated wiring.

Tighten connections and repair damaged wiring. Replace defective heaters (para 4-35).

Step 8. Test for defective evaporator fan motor.

Replace motor (para 4-38 and 4-40).

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