TM9-4120-398-14
TABLE 4-2. UNIT TROUBLESHOOTING-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 5. Check for tripped thermal cutout (TCO) in fan motor.
Allow to cool and restart air conditioner. (See paragraph 2-10.)
If problem still exists, refer to supervisor.
AIR CONDITIONER STOPS - AUTO MODE.
3.
Step 1. Check for tripped circuit breaker.
Reset circuit breaker. (See figure 21.)
Step 2. Check for defective mode selector switch (S1.)
Replace switch. (See paragraph 4-25.)
Step 3. Check for defective thermostat control switch (S2 )
Replace switch. (See paragraph 4-26.)
Step 4. Check for defective control relay (K4, K5.)
Replace relay. (See paragraph 4-28.)
Step 5. Check for continuity in high temperature cutout switch.
Replace defective cutout. (See paragraph 4-38.)
If problem still exists, refer to supervisor.
NO (OR REDUCED) COOLING.
4.
Step 1. Check sight gIass for bubbles or discoloration.
Shut down air conditioner and contact supervisor.
Step 2. Check for defective time delay relay (K6).
Replace time delay relay. (See paragraph 4-28.)
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