TM9-4120-370-14
TO35E9-229-1
TABLE 4-2. TROUBLESHOOTING (cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 5. Check operation of compressor (B1).
If not operating, contact direct support maintenance.
4. AIR CONDITIONER STOPS COMPLETELY DURING COOL MODE OPERATION.
Step 1. Check to see if circuit breakers (CB1, 2, or 3) are tripped.
Reset circuit breaker(s).
Step 2. Step 2. Check to be sure condenser fan starts immediately when a restart in COOL mode is made. If
condenser fan does not start, test as follows:
Disconnect input power before performing internal electrical troubleshooting.
Voltages used-can-be deadly.
a. Test condenser fan motor relay (K7). (See para 454. ) Replace if defective.
b. Test condenser fan motor (B2). (See para 4-64.) Contact direct support maintenance if motor is
defective.
Step 3. Check to be sure there is no restriction to air flow through condenser section
Clean all obstructions from condenser inlet, outlets, and condenser coil.
CAUTION
If circuit breaker trips again soon after restart in COOL mode, do not attempt
another restart, and contact direct support maintenance for refrigeration system
troubleshooting.
5. COMPRESSOR AND CONDENSER FAN STOP DURING COOL MODE OPERATION, BUT CONDITIONED
AIR (EVAPORATOR) FAN CONTINUES TO RUN.
Step 1. Check to see if high-or-low-pressure cutout switch (S5 or S6) is tripped.
Press, then release tripped reset button
CAUT I ON
Wait at least two minutes before restarting in COOL mode. If either pressure cut-
out switch trips soon after a restart is made, do not attempt another restart, and
contact direct support maintenance for refrigeration system troubleshooting.
6. CONDITIONED AIR (EVAPORATOR) FAN DOES NOT START, OR STOPS DURING OPERATION, IN ANY
OPERATING MODE.
Step 1. Check operation of conditioned air (evaporator) fan motor relay (K8).
4-39
