Desolder the BLACK wires from the "AC-L" point and "T/S" point.

Learn how to solder and desolder connections here!

Desolder the WHITE wire from the "AC-N" point.

Desolder the RED wire from the "FAN-RED".

Desolder the GREY wire from the "24V" point.

Desolder the BROWN wires from "HEAT1," and "HEAT2" points.

Be sure to use desoldering wick when you remove the wire connections.