TM 9-4120-402-14
Table 4-3. UNIT TROUBLESHOOTING - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. COMPRESSOR STARTS NORMALLY, BUT HIGH PRESSURE CUTOUT SWITCH TRIPS.
- continued
Step 2. Check to be sure there is no restriction to air flow through condenser section.
Clean all obstructions from condenser inlet, outlet, and condenser coil.
Step 3. Check to be sure that condenser fan is operating (Air being discharged from condenser air
outlet).
NOTE
Condenser fan and conditioned air (evaporator) fan are both driven by the same motor. If one
fan is operating and the other is not, check for loose fan on motor shaft. If both fans are not
operating, check for loose electrical connections, defective motor controller (paragraph 4-37), or
defective motor (paragraph 4-47).
Step 4. With unit operating in COOL mode, check condition of refrigerant in sight glass.
If indicator color is in the yellow zone or numerous bubbles appear in the window, turn selector rotary
switch to OFF/RESET and notify supervisor.
Step 5. Reset (PUSH) HIGH PRESSURE CUTOUT switch and restart unit.
If unit does not start, notify supervisor.
4-43
