E7
Cavin Low Voltage or Power Supply Fault

E7 error code and interior lights or display flicker or go out intermittently

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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

Defective low-voltage power supply on main PCB, Loose power cord connection, Damaged AC filter board, Burnt transformer or DC regulator

How to Fix / Troubleshooting

Safety first: Unplug the unit before opening any electrical compartments.

Steps:

  • Check outlet: Test the wall outlet with another appliance or a plug-in tester to ensure stable voltage and proper grounding.
  • Inspect power cord: Examine the Cavin power cord for cuts, kinks, or burn marks. Replace if damaged.
  • Access control area: Remove the rear service panel to access the main control board and any separate AC filter/power board.
  • Visual inspection: Look for burnt components, discoloration, or bulging capacitors on the power supply section of the PCB.
  • Connector check: Reseat the main power connector and any low-voltage harnesses leading to the display and lights.

Repair: If visible damage is present on the power supply section or if E7 persists after verifying the outlet and cord, the main control board or AC filter board will likely need replacement. Due to live-voltage risks, board-level repair should be left to a qualified technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board / AC Power Filter Board
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