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Table 23 — Troubleshooting Procedure (cont)
LEGEND
PROBLEM POSSIBLE CAUSE CORRECTION PROCEDURE
Discharge Pressure too
Low
Outdoor temperature too low Install low-ambient control.
Condenser airflow too high Check and adjust.
Low charge Check for and repair leaks and add refrigerant as necessary.
Compressor fault Check suction and discharge pressure.
Suction Pressure too Low
Discharge pressure is low See Discharge Pressure Too Low section of this table above.
Low thermal load Check building load.
Low refrigerant Check for and repair leaks and add refrigerant as necessary.
Low airflow in evaporator
Clean filter.
Remove scale.
Check for blockage in ducts.
Check fan rotation.
Check motor operation.
Check belts.
Low refrigerant flow in evaporator
Check for obstruction in filter drier.
Check for obstruction in TXV.
Check super heating.
Check position of TXV bulb and equalizer.
Suction Pressure too High
High thermal load Check design conditions.
Compressor defect Check pressures, and replace if necessary.
Condensate Water Leaks
Defective connection Check and correct.
Blocked drain Clean drain pan.
Drain lines incorrect Check and correct.
TXV — Thermostatic Expansion Valve
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