OPERATIONAL CHECKOUT AND TROUBLESHOOTING PROCEDURES

TM 9-4120-428-14

OPERATOR'S MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

OPERATIONAL CHECKOUT AND TROUBLESHOOTING PROCEDURES

USE OF TROUBLESHOOTING TABLE

Troubleshooting Procedures (Table 1) contains troubleshooting information useful to operators in diagnosing and correcting

malfunctions or unsatisfactory operation of the air conditioner. The table lists the common malfunctions an operator is most

likely to encounter. Corrective actions indicate what steps the operator should take.

The operator should determine the malfunction symptom that most closely describes the immediate situation and then

perform the corrective action steps in the order listed.

This manual does not list all possible malfunction symptoms that may be encountered, nor can it list all possible corrective

actions.

A malfunction or corrective action beyond the scope of the operator's capabilities must be reported to unit maintenance.

Table 1. Troubleshooting Procedures

MALFUNCTION 1

UNIT DOES NOT START

SYMPTOM

Air conditioner does not start in any mode.

MALFUNCTION

No power connection.

CAUTION

During cool weather, DO NOT start in COOL mode for at least four hours.

CORRECTIVE ACTION

Re-connect input power if disconnected.

Check to see if CONTROL CIRCUIT BREAKER or COMPR CIRCUIT BKR has tripped.

CORRECTIVE ACTION

Reset the circuit breakers.

0008 00-1