Display shows F3 and the unit may randomly shut off or reboot.

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.

Possible Causes

Failed low-voltage power supply on main board, Loose AC input wiring, Faulty surge protector or power strip, Intermittent neutral connection

Safety: Unplug the cooler before inspecting the power input.

Check outlet: Plug a lamp or tester into the same outlet to confirm stable power. Avoid using extension cords or power strips.
Inspect power cord: Check the TYLZA power cord for cuts, kinks, or burn marks.
Inspect main board input: Remove the rear cover and verify that the AC input wires are tight on the main control board.
Replace board if needed: If F3 persists and power to the outlet is stable, the internal power supply on the main board may be failing. Replace the main control board.

Hard 4/5

Main Control Board

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