Daikin | Fan Coil

Error Code U3

Troubleshooting guide for the Daikin Fan Coil system fault U3.

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

Check operation not executed or transmission error

Potential Causes & Solutions

  • Check operation is not executed.

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