FATC 28 TROUBLE SHOOTING STEP INSPECTION ACTION 1 Check working of AC compressor as per logic (correct speed) Yes Go to next step No Check software 2 Inspect refrigerant system performance Perform refrigerant system performance test (Refer AC system performance test) is operating normal? Yes Operation is normal. (Recheck malfunction symptoms) No Go to next step 3 Verify whether malfunction is in blower unit intake and condenser or another. Are refrigerant’s high-pressure and low pressure values both high? Yes Go to next step No Go to step 6. 4 Inspect blower unit intake is blower unit intake clogged Yes Remove obstruction. (If air does not reach evaporator within cooling unit, heat exchange does not occur, refrigerant pressure becomes high, and therefore, removal of obstruction is necessary.) No Go to next step 5 Inspect condenser is it okay? Yes Adjust refrigerant to specified amount. (Excessive amount of refrigerant.) No Replace condenser, or repair and clean condenser fins. 6 Verify whether malfunction is in expansion valve, receiver/drier and refrigerant lines or elsewhere Are refrigerant’s high-pressure and lowpressure values low? Yes Go to next step No Go to step 14 7 Verify whether malfunction is in expansion valve and receiver /drier or elsewhere immediately after A/C compressor operates, does refrigerant’s high-pressure value momentarily rise to correct value, then fall and stay below it? (Is there negative pressure on lowpressure side? Yes Go to next step No Go to step 10.
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