OPERATIONAL CHECKOUT AND TROUBLESHOOTING PROCEDURES

TM 9-4120-428-14

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UNIT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

OPERATIONAL CHECKOUT AND TROUBLESHOOTING PROCEDURES

MALFUNCTION 1

UNIT DOES NOT START

SYMPTOM

Air Conditioner does not start in any mode

MALFUNCTION

No input power connection.

CORRECTIVE ACTION

If power has been disconnected, re-connect the power.

CAUTION

If the input power has been disconnected for an unknown period of time, DO NOT start the unit in COOL MODE until the

power has been reconnected for at least four hours.

Circuit breakers are tripped.

CORRECTIVE ACTION

Reset the circuit breakers.

Loose or damaged electrical connectors and damaged wires in wiring harness.

CORRECTIVE ACTION

Tighten or replace connectors or repair damaged wires as necessary.

No internal wiring for correct connection.

CORRECTIVE ACTION

Be sure internal wiring is connected to terminal board TB3.

There are defective circuit breakers.

CORRECTIVE ACTION

Replace as necessary. (WP 0033 00).

There is a defective MODE SELECTOR switch.

CORRECTIVE ACTION

Replace if defective. (WP 0032 00).

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