Er
Hisense General Control Error / Firmware Fault

Display shows Er or Err and the controls may be unresponsive or partially functional.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Glitched microcontroller on main PCB, Corrupted firmware, Loose control panel connections, Power surge damage

How to Fix / Troubleshooting

Unplug the wine cooler for at least 5 minutes. This allows the control electronics to fully reset.

  • Power cycle: After 5–10 minutes, plug the unit back in and observe the display. If Er clears, monitor operation.
  • Check panel connections: Remove the control panel and rear PCB cover to inspect and reseat all connectors between the display and main board.
  • Surge protection: If the error followed a storm or outage, consider using a surge protector after repairs.

If Er returns frequently, the main control PCB or display PCB may need replacement. Firmware updates, if available, must be performed by an authorized Hisense service center.

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Repair Difficulty

Hard 4/5

Required Part

Main Control PCB
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