UNIT MAINTENANCE AIR CONDITIONER, HORIZONTAL, COMPACT

TM 9-4120-428-14

UNIT MAINTENANCE

AIR CONDITIONER, HORIZONTAL, COMPACT

(NSN 4120-01-502-1319)

TROUBLESHOOTING INDEX

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

The Symptom Index contains troubleshooting information useful to unit maintenance technicians in diagnosing and

correcting malfunctions or unsatisfactory operation of the air conditioner.

The Troubleshooting Table (WP 0010 00) lists the common malfunction symptoms and unsatisfactory performance

characteristics that technicians are most likely to encounter. Included are the test and inspection steps to determine the cause

and the corrective action(s) that should be performed for each possible cause lifted.

The technicians should first find the malfunction symptom or unsatisfactory performance characteristic in the table that most

closely describes the immediate situation. Then perform the test and inspections, and determine corrective action steps in the

order in which they are listed.

This manual cannot list all possible situations that may be encountered, nor can it list all test and inspection and corrective

action steps that may be taken. If a condition is encountered that cannot be resolved within the capabilities and experience of

unit maintenance personnel, then assistance should be requested from direct support maintenance.

SYMPTOM INDEX

TROUBLE

MALFUNCTION NO.

Air Conditioner

Unit Does not Start -------------------------------------------------------------------------------------------- 1

Insufficient Cooling ------------------------------------------------------------------------------------------- 4

Unit Operates Continuously on Cooling Cycle -------------------------------------------------------------- 8

Unit Fails to Heat--------------------------------------------------------------------------------------------- 11

Excessive Noise ---------------------------------------------------------------------------------------------- 12

Evaporator

Evaporator Fan Does not Start-------------------------------------------------------------------------------- 2

Evaporator Fan Stops During Operation --------------------------------------------------------------------- 2

Evaporator Air Output Volume Low------------------------------------------------------------------------- 9

0009 00-1