TM 9-4120-404-14
Table 3-3. Unit Troubleshooting. - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 1.
Check TEMP/PRESSURE light on control panel assembly.
If TEMP/PRESSURE light is not on, proceed to step 2.
If TEMP/PRESSURE lig ht is on, proceed to step 7.
Step 2.
Check for defective heater relay.
If heater relay is defective, replace it. If heater relay is not defective,
proceed to next step.
Step 3.
Check for defective mode selector switch.
If mode selector switch is defective, replace it. If mode selector switch is
not defective, proceed to next step.
Step 4.
Check for defective temperature control potentiometer.
If temperature control potentiometer is defective, replace it. If temperature
control potentiometer is not defective, proceed to next step.
Step 5.
Check for defective thermistor.
If thermistor is defective, replace it. If thermistor is not defective, proceed
to next step.
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