TM 9-4120-378-14
Table 4-2. Unit Troubleshooting - Continued
Malfunction
Test or Inspection
Corrective Action
EVAPORATOR OR CONDENSER FAN MOTOR FAILS TO OPERATE - Continued
3.
Inspect for bad Evaporator Fan Speed Control switch by checking continuity with
Step 6.
ohmmeter. (Refer to paragraph 4.24.)
Replace bad switch. (Refer to paragraph 4.24.)
Step 7.
Inspect Mode Selector Rotary switch for improper adjustment or damage. (Refer
Replace bad switch. (Refer to paragraph 4.24.)
Disconnect the power source before performing any troubleshooting func-
tion.
COMPRESSOR WILL NOT START
4.
Step 1.
Make sure that COMPRESSOR or Control Circuit Breakers or selector switch is
properly set.
Reset controls properly.
Check for open contacts of high-or-low-pressure cut-out switches. (Refer to
Step 2.
a. Reset pressure switches.
b. Report fault to Direct Support Maintenance personnel if condition continues.
Check for loose electrical connections or faulty wiring.
Step 3.
a. Tighten loose connections.
b. Replace wiring if necessary. (Refer to paragraph 5.27.)
Make continuity check of control circuit to determine whether open circuit exists.
Step 4.
(Refer to paragraph 4.24.)
Repair open circuit or replace wire. (Refer to paragraph 4.24.)
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