TM 9-4120-395-14&P
4-15. TRUBLESHOOTING - Continued
Table 4-2. Unit Maintenance Troubleshooting- Continued
MALFUNCTION
TEST OT INSPECTED
CORRECTIVE ACTION
3. INDOOR AND OUTDOOR RFANS BOTH RUN, BUIT COMIPRESSOR DOES NOT START.
High voltage is used in the operation ,of this equipment. Death on contact or severe
injury may result if personnel fail to observe safety precautions.
Step 1. Check for loose or damaged electrical connectors or wires, See para 4-23.
Tighten or replace connectors, or repair damaged wires See para 4-23.
Step 2. Test operation of lockout relay. See para 4-28.
Replace relay if defective. See para 4-28.
Step 3. Test operation of compressor contractor. See para 4-32.
Replace contractor if defective. See pare 4-32.
Step 4. Listen for operation of compressor.
If not operating, contact Direct Support Maintenance.
4. AIR CONDITIONER STOPS COMIPLETELY DURING COOL MODE OPERATION.
High voltage is used in the operation of this equipment. Death on contact or
severe injury may result if personnel fail to observe safety precautions.
Step 1. Check to be sure indoor fans and outdoor fan (15 and 12, Figure 1-2) start immediately when a restart in
COOL mode is made. If fans do not start, test as follows:
Disconnect input power before performing internal electrical troubleshooting.
a. Test fan relay. See para 4-33.
Replace if defective. See para 4-33.
Replace if defective. See para 4-38 and 4-45.
Step 2. Check to be sure there is no restriction to airflow. See para 4-2b.
Remove restriction from air path.
4-20
