TM 9-4120-399-14
Table 4-3. Unit Troubleshooting. (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
AIR CONDITIONER FAILS TO OPERATE IN ANY MODE. (Continued).
1.
Check for loose electrical connections.
Step 6.
Tighten electrical connections.
See wiring schematic Figure 1-4 and check for defective wiring.
Step 7.
Repair wires as required.
If unit still malfunctions, notify your supervisor.
EVAPORATOR AND CONDENSER FANS BOTH RUN, BUT COMPRESSOR DOES
2.
NOT START AFTER TIME DELAY.
Check to see if high or low pressure cut-out switch has tripped.
Step 1.
Push reset button.
supervisor.
Check operation of mode selector switch.
Step 2.
Turn switch to VENTILATE, wait 2 minutes, then reset to COOL.
NOTE
Allow 30 seconds time delay before
compressor starts.
Check for loose or damaged electrical connectors, or damaged wires
Step 3.
in wiring harnesses.
Tighten or replace connector or repair damaged wires.
Check operation of time delay relay (TD1).
Step 4.
Replace if defective per para. 4-
Check that relay is functioning.
36.
Step 5.
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