TM 9-4120-388-14
Table 4-2. Unit Troubleshooting (Cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Check operation of mode selector switch
Turn switch to OFF, then reset to COOL.
NOTE
Allow 30 seconds time delay before compressor starts.
Disconnect input power before performing internal electrical troubleshooting.
Step 3. Check for loose or damaged electrical connectors, or damaged wires in wiring harnesses.
Tighten or replace connectors, or repair damaged wires.
Step 4. Check operation of time delay relay (K3).
Test Relay. Replace relay if defective (See para 4-54).
Step 5. Check operation of compressor motor relay (K1).
Test Relay. Replace relay if defective (See para 4-55).
Step 6. Check operation of circuit breaker (CB1) primary contacts.
Teat Circuit Breaker. Replace circuit breaker if defective (See para 4-51).
Step 7. Check operation of compressor (B1).
If not operating, notify your supervisor.
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