!
error Velux
Error Code LED blinks 3 times
Indicates a wiring error. The light on the control unit will flash.
? What Causes This
Wiring interruption or short-circuit.
✓ How to Fix It
Check for damage and reconnect properly.
Source: page 63 of the official manual
From the manual
This error code appears in:
Velux Kfx 210