TM 9-4120-407-14
Table 3-3. Unit Troubleshooting Table - Cont
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. COMPRESSOR DOES NOT START IN COOL MODE. - Cont
If the high pressure cutout switch trips, it is an indication that the
refrigerant system is operating with excessively high discharge
pressure. Equipment damage can result if the cause of the excessive
pressure is not corrected.
Step 2. Check to see if the HIGH PRESSure CUTOUT switch (2) has tripped.
Push and release to reset.
Step 3. Check if motor controller needs to be reset.
Turn MODE selector rotary switch (3) to OFF RESET, then back to COOL.
If the coil frost switch is defective, `replace it per paragraph 3-27.
3. COMPRESSOR STARTS NORMALLY, BUT HIGH PRESSURE CUTOUT SWITCH SOON TRIPS.
Step 1. Check to be sure the fabric cover (1) is rolled up and secured.
Roll up and secure the fabric cover per paragraph 2-7.
Open the condenser discharge air deflector door per paragraph 2-7.
Remove obstructions.
3-52
