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TM 9-4120-389-14
Table 4-2. UNIT TROUBLESHOOTING- (cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check operation of mode selector switch. Turn switch to VENT, then reset to COOL.
NOTE
Allow 30 seconds time delay before compressor starts.
Step 3.
Check for loose or damaged electrical connectors, or damaged wires in wiring harnesses.
Tighten or replace connectors, or repair damaged wires (See para. 4-36).
Step 4.
Check operation of time delay relay (K1).
Test relay (See para. 4-50). Replace defective relay.
Step 5.
Check operation of compressor relay (K3).
Test relay (See para. 4-49). Replace defective relay.
Step 6.
Check operation of compressor circuit breaker.
Test circuit breaker (See para. 4-39). Replace defective circuit breaker.
Step 7
Check operation of compressor (B1). If not operating, contact your supervisor and Direct
Support Maintenance.
4-43
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