Daikin Chiller

Daikin Chiller Error Code 74

Troubleshooting guide for the Daikin Chiller system fault 74.

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What It Means

System No.

Possible Causes

  • Clogged refrigerant piping.
  • Defective connector contact.
  • Shortage of gas.
  • Defective LPS.

Not sure which one it is — or if it's none of these? Try ACLogics today.

Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis

System No. 2 Actuation of low pressure switch (LPS)

All Recorded Causes

Clogged refrigerant piping Defective connector contact Shortage of gas Defective LPS

Verify Before Replacing Parts

  1. Confirm the exact Daikin model family and chiller context before acting on a generic code description.
  2. Verify airflow first, then confirm operating pressures and temperature relationship before adjusting charge, since clogged refrigerant piping.
  3. Look for restrictions, iced coils, or dirty heat-transfer surfaces that can mimic a charge problem, and separately confirm defective connector contact.
  4. After the correction, run the system long enough to confirm the chiller fault does not return under normal load.

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