Vaillant Display PCB / LED Board Failure

Indoor unit display is blank but unit can still be controlled by remote

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 display PCB, Loose ribbon cable between main PCB and display, Damaged LEDs from power surge

Safety: Turn off power before removing the front panel.

Check brightness setting: Some Vaillant models allow dimming or turning off the display via remote. Verify display settings in the user manual.
Inspect connections: Remove the front panel and check the ribbon cable or connector between the main PCB and display board. Reseat firmly.
Visual inspection: Look for burn marks or corrosion on the display PCB.
Replace display board: If connections are good and the display remains blank, replace the indoor display PCB.

Medium 3/5

Indoor Display PCB

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