E4 displayed and pump will not start; may be accompanied by a blank or flickering screen.

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

Damaged Hurlcon keypad membrane, Water ingress into keypad, Loose ribbon cable to main PCB, Failed display module

Safety: Disconnect power before opening the keypad or controller housing.

Inspect keypad: Look for cracks, bubbling, or water under the keypad overlay. Dry the surface and surrounding area.
Check ribbon cable: Open the controller and reseat the keypad ribbon cable into the main PCB connector.
Test buttons: With power restored, press each button and observe if the display responds. Non-responsive keys indicate keypad failure.

If E4 persists and buttons do not respond, the Hurlcon keypad or display board must be replaced as a module.

Medium 3/5

Hurlcon pump keypad / display module

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