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TM 5-4120-361-14
Table 4-2.
Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
EVAPORATOR
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
Step 9.
Step 10.
4.
COMPRESSOR
Step 1.
Step 3.
OR CONDENSER FAN FAILS TO OPERATE - Continued
Check to see if mode selector rotary switch is improperly adjusted
or is defective.
Replace switch if defective (para 4-26).
Check to see if evaporator fan speed control switch is defective.
Replace defective switch (para 4-26).
Check to see if condenser fan motor thermal protector is defective.
Replace defective thermal protector (para 4-24).
Check to see if evaporator fan motor thermal protector is defective.
Replace defective thermal protector (para 4-22).
Check to see if evaporator fan or condenser fans are binding.
Relieve binding or replace fan (para 4-21).
Check to see if condenser fan high-low thermostat switch is
defective.
Replace defective thermostat switch (para 4-31).
Test condenser fan relay for defective operation.
Replace defective relay (para 4-27).
Test evaporator fan motor and condenser fan motor for defective
operation.
Replace defective fan motor (para 4-21 and 4-23).
WILL NOT START
Set circuit breakers to ON position.
Turn mode selector switch to
COOL position and temperature selector switch to COOLER position.
Reset controls properly.
Check for defective or tripped compressor internal temperature
overload switch.
Set circuit breaker and mode selector switch to off.
Disconnect
main power cable for 45 minutes; then, reconnect cable and reset
controls.
If condition continues, report deficiency to direct
support maintenance.
Check for loose electrical connections or faulty wiring.
Tighten loose connections.
Repair faulty wiring.
4-11
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