TM 9-4120-404-14
Table 3-3. Unit Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 1. Check TEMP/PRESSURE fault light on control panel assembly.
If light is on, proceed to step 2.
If light is not on, proceed to step 11.
Step 2. Check for defective thermistor.
between the two thermistor leads. Check that resistance between leads is
between 2.4 and 33.2 kilo ohms.
If thermistor fails this test, replace it. If thermistor is not defective, proceed
to next step.
Step 3. Check for defective mode selector switch on control panel assembly.
Replace mode selector switch if defective. If mode selector switch is not
defective, proc eed to next step.
Step 4. Check for defective control panel temperature control on control panel
assembly.
Replace temperature control if defective. If temperature control is not
defective, proceed to next step.
Step 5. Check for defective compressor/condenser fan relay.
defective, proceed to next step.
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