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C4: Jumper Cap Malfunction


Safety Note: Before any component is electrically disconnected in the unit, shut off main power. Inverter board DC bus voltage can take up to 15 min to discharge.

Caution: Do not plug or unplug components while electrical power is present, this can damage the equipment and control boards.

Step 1: Check the Jumper Cap

  • Inspect the jumper cap for any visible signs of damage, such as breakage, burning, or unusual discoloration.

  • Ensure that the jumper cap is correctly installed according to the system's documentation and wiring diagrams. Check for any loose or disconnected connections.

  • If applicable, measure the resistance or continuity across the jumper cap terminals using an appropriate testing tool. Compare the readings to the manufacturer's specifications to verify proper functionality.

  • Check for any surrounding components or wires that may be affecting the jumper cap's performance. Look for signs of short circuits or other electrical issues.

  • If the jumper cap is damaged or not functioning correctly, replace it with a new one that meets the system requirements.


Step 2: Check the Outdoor Board

  • Examine the outdoor board for any visible signs of damage, burnt components, or loose connections.

  • Inspect the surrounding components on the outdoor board that may interact with the jumper cap. Look for issues such as damaged traces, burnt resistors, or faulty connectors.

  • Verify that the outdoor board is receiving power and signals as expected. Use appropriate testing equipment to measure voltages and check for abnormalities.

  • If problems persist, consult the system's documentation or contact customer support for further assistance.

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