ORGANIZATIONAL TROUBLESHOOTING TABLE - continued

TM 5-4120-374-13

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE

ACTION

Disconnect input power source before internal electrical troubleshooting.

Step 2. Test fan motor for resistance.

Consult Appendix F and replace fan motor if damage is indicated (para. 4-19).

Step 3. Check condenser fan for damage or binding.

Relieve binding or replace damaged circulating fan (para. 4-20).

Step 4. Test fan motor capacitor for continuity, leakage and capacitance.

Replace capacitor if damage is indicated (para. 4-24).

COMPRESSOR

1. COMPRESSOR WILL NOT START

Step 1. Check the selector switch.

a. Observe position of the switch. Be sure switch is NOT in the OFF or FAN positions.

b. Place the switch in the COOL position. If the air conditioner will not operate in the

COOL position, check for a defective switch using a multimeter.

Replace defective switch (para. 4-22).

Step 2. Check the THERMOSTAT.

a. Observe position of the THERMOSTAT. Be sure THERMOSTAT is in the COOLER

position.

b. Rotate THERMOSTAT to the COOLER position. If the compressor will not start,

check for a defective THERMOSTAT using a multimeter.

Replace defective THERMOSTAT (para. 4-23).

Disconnect input power source before internal electrical troubleshooting.

Step 3. Check for loose electrical connections.

Tighten loose electrical connections.

Step 4. Inspect for defective wiring.

Replace defective wiring. Use identical type wire, consult Appendix F, and solder

all terminal connections (para. 4-28).

Step 5. Check start relay for continuity.

Replace start relay if continuity is not indicated (para. 4-27).

Step 6. Check compressor for proper operation and damage (para. 4-29)

Report condition to direct support maintenance personnel.

2. COMPRESSOR STARTS BUT GOES OUT ON OVERLOAD

Step 1. Test run capacitor for continuity, leakage and capacitance.

Replace capacitor if damage is indicated (para. 4-26).

Step 2. Test fan motor for resistance.

Consult Appendix F and replace fan motor if damage is indicated (para. 4-19).

Step 3. Check expansion valve for proper operation and damage (para. 4-34).

Report condition to direct support maintenance personnel.

Step 4. Check compressor for proper operation and damage (para. 4-29).

Report condition to direct support maintenance personnel.

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