EVAPORATOR OR CONDENSER FAN FAILS TO OPERATE

TM 5-4120-369-14

Troubleshooting - Continued

Table 4-2.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

INSUFFICIENT COOLING - Continued

Check evaporator fan motor for a defective thermal protective device or

Step 8.

evaporator fan motor is defective.

Replace motor (paragraph 4-21).

Check refrigerant system for insufficient charge by inspecting liquid sight

Step 9.

indicator. Presence of bubbles indicates a low refrigerant charge.

Report condition to Direct Support maintenance.

Check for intermit tent compressor operation.

Step 10.

Report condition to Direct Support maintenance.

EVAPORATOR OR CONDENSER FAN FAILS TO OPERATE

Check to see if main power cable is connected.

Step 1.

Connect cable to power source.

Check to see if main power receptacle or plug connectors are defective.

Step 2.

Replace connectors or receptacle.

Check to see if mode selector rotary switch is improperly adjusted or

Step 3.

is defective.

Replace switch if defective (paragraph 4-26).

Check to see if evaporator fan speed control switch is defective.

Step 4.

Replace defective switch (paragraph 4-26).

Check to see if condenser fan motor thermal protector or evaporator fan

Step 5.

motor thermal protector is defective.

Replace defective fan motor(s) (paragraph 4-22 or 4-23).

Check to see if evaporator fan or condenser fans are

Step 6.

binding.

Relieve binding or replace fan (paragraph 4-21 or 4-22).

Check to see if condenser fan high-low thermostat switch is defective.

Step 7.

Replace defective thermostat switch (paragraph 4-31).

Test condenser fan relay for defective operation.

Step 8.

Replace defective relay (paragraph 4-27).

Test evaporator fan motor and condenser fan motor for defective operation.

Step 9.

Replace defective fan motor (paragraph 4-21 and 4-23).

4-6