FATC 44 d. REFRIGERATION CYCLE TROUBLESHOOTING Sr. No. Problem Possible Cause Remedy 1 Insufficient refrigerant Condition 5. Air conditioner does not cool effectively Symptoms in refrigerant cycle 6. Pressure on both the high and low pressure sides is low 7. Air around the air outlet is slightly cold Cause 8. There is gas leakage in the refrigerating cycle Diagnosis 9. Insufficient refrigerant in the refrigerating cycle 10. Refrigerant leakage Countermeasures 11. Locate the leakage and repair 12. Recharge refrigerant to the specified amount 2 Excessive refrigerant or insufficient condenser cooling. Condition 13. Air conditioner does not cool effectively Symptoms in refrigerant cycle 14. Pressure on both the high and low pressure sides is high. Cause 15. Refrigerant is overcharge in the refrigerating cycle causing poor cooling performance 16. Condenser cooling performance is poor. Diagnosis 17. Excessive refrigerant in the refrigerating cycle. 18. Overcharged refrigerant. Poor condenser cooling performance. Countermeasures 19. Clean the condenser. 20. Tighten the fan belt to the correct tension. 21. Above are all normal check the refrigerant. 3 Entry of moisture in the refrigerant cycle Condition 22. Air conditioner alternately cools and does not cool. Symptoms in refrigerant cycle 23. During operation, the pressure on the low pressure side alternates between vacuum and normal. Cause 24. The moisture mixed in the refrigerant in the refrigerating cycle freezes in the expansion valve orifice, blocking the cycle. After a time, the ice melts and normal conditions return Diagnosis 25. The drier is in an oversaturated condition. 26. The moisture in the refrigerating cycle freezes the expansion valve orifice, impeding refrigerant circulation. Countermeasures 27. Remove the moisture by repeated evacuation. 28. Recharge new refrigerant to the specified amount.
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