Power Module Abnormality

Hva betyr U6 ?

An abnormality is detected in the power module, often signaled by overcurrent during module operation (which can trigger UF or UP errors). This critical fault can be caused by a closed outdoor stop valve, low power supply voltage, incorrect or loose compressor wiring, or a defective compressor or outdoor power circuit board.

• Power module failure or internal short circuit.
• DC bus voltage abnormal.
• Control board communication error with power module.
• Overcurrent or overvoltage protection triggered within the power module.

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1. 1

   Verify that the outdoor stop valve is fully open.

2. 2

   Check the facility's power supply voltage to ensure it meets the system specifications.

3. 3

   Correct the wiring (U, V, W phase) to the compressor if any connections are loose, disconnected, or conversed.

4. 4

   Check the compressor for defects, referring to diagnostic procedures in section 10-6 of the manual.

5. 5

   If the above steps do not resolve the issue, replace the outdoor power circuit board.