Daikin VRV

Daikin VRV Error Code JA

Troubleshooting guide for the Daikin VRV system fault JA.

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What It Means

Malfunction of high pressure sensor.

Possible Causes

  • Defective connector contact.
  • Connection of low pressure sensor in mistake for high pressure sensor.
  • Defective high pressure sensor.
  • Defective outdoor unit PCB.

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

Malfunction of high pressure sensor

All Recorded Causes

Defective connector contact Connection of low pressure sensor in mistake for high pressure sensor Defective high pressure sensor Defective outdoor unit PCB

Verify Before Replacing Parts

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

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