TM 9-4120-404-14
Table 3-3. Unit Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 6. Check for defective coil frost switch.
If coil frost switch is defective, replace it.
If coil frost switch is not defective, proceed to next step.
Step 7. Check to see if high pressure cut-out switch has tripped.
Push reset button. If compressor fails to start, proceed to next step.
Step 8. Check to see if low pressure cut-out switch has tripped.
Push reset button. If compressor fails to start, proceed to next step.
Step 9. Check for tripped condenser fan motor thermal cut out switch.
If condenser fan motor thermal cut out switch is defective, replace condenser
fan motor. If condenser fan motor thermal cut out switch is not defective,
proceed to next step.
Step 10. Check for proper operation of logic box assembly.
is defective, replace logic box assembly.
If logic box assembly is not defective, proceed to next step.
Step 11. Check for defective light on control panel assembly.
If control panel lights are not defective, notify your supervisor.
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