Table 4-1. Troubleshooting - continued

TM 5-4120-339-14

Table 4-1. Troubleshooting (continued)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

SIGHT GLASS APPEARS YELLOW INSTEAD OF GREEN (continued)

Step 2.

Check for yellow in sight glass after system has been purged.

If the sight glass still shows yellow, remove compressor (figure 4-18) and dehydrator

(figure 4-16), flush and purge system (paragraph 4-22), replace dehydrator

recharge the system with refrigerant (paragraph 4-10].

AIR CONDITIONER WILL NOT START IN ANY MODE

Step 1.

Check electrical power source.

Repair electrical power source.

Step 2.

Inspect for burned out fuse(s) (paragraph 3-12h and figure 3-18).

Replace burned out fuse(s).

Step 3.

Inspect and test circuit breaker (paragraph 3-12m).

Replace damaged or defective circuit breaker.

Step 4.

Inspect and test selector switch (paragraph 3-12b).

Replace damaged or defective selector switch.

Step 5.

Continuity check internal power circuit (figure 3-8).

Repair or replace defective wiring.

10.

FANS DO NOT OPERATE

Step 1.

Inspect and test fan motor (paragraph 3-10c).

Repair or replace damaged or defective fan motor.

Step 2.

Inspect and test fan relays (paragraph 3-12g).

Replace damaged or defective fan relay(s).

Step 3.

Inspect and test fan speed switch (paragraph 3-12c).

Replace damaged or defective fan speed switch.

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