Daikin | SkyAir

Error Code H4

Troubleshooting guide for the Daikin SkyAir system fault H4.

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.

System Diagnosis

Malfunction of low pressure switch (LPS)

Potential Causes & Solutions

  • Defective low pressure switch.
  • Broken wire.
  • Defective outdoor unit PCB.
  • Defective connector contact.

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