Cooling temperature does not reach setpoint

Question

Accepted Answer

Refrigerant shortage (leak). Check: Measure suction/discharge pressure to assess refrigerant level What to do: Measure suction/discharge pressure to assess refrigerant level → Visual inspection of evaporator icing → Check defrost heater and timer operation → Verify expansion valve sensing bulb contact → Check for refrigerant leaks using detector or soapy water → Assess compressor suction/discharge valve efficiency Expansion valve opening malfunction. Check: Visual inspection of evaporator icing What to do: Visual inspection of evaporator icing → Check defrost heater and timer operation → Verify expansion valve sensing bulb contact → Check for refrigerant leaks using detector or soapy water → Assess compressor suction/discharge valve efficiency Excessive evaporator icing. Check: Check defrost heater and timer operation What to do: Check defrost heater and timer operation → Verify expansion valve sensing bulb contact → Check for refrigerant leaks using detector or soapy water → Assess compressor suction/discharge valve efficiency Compressor performance degradation. Check: Verify expansion valve sensing bulb contact What to do: Verify expansion valve sensing bulb contact → Check for refrigerant leaks using detector or soapy water → Assess compressor suction/discharge valve efficiency Excessive cooling load. Check: Check for refrigerant leaks using detector or soapy water What to do: Check for refrigerant leaks using detector or soapy water → Assess compressor suction/discharge valve efficiency

Cooling temperature does not reach setpoint

Likely causes

Refrigerant shortage (leak)

Expansion valve opening malfunction

Excessive evaporator icing

Compressor performance degradation

Excessive cooling load

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