I have quoted the section in the manual as to the purpose of the white/red wire. Page 26
Link for manual a couple of pages back - looks like some of your other wires are for can-bus, see manual
Thanks @oldiebut goodie.. so it‘s for use with the Ebers diagnostic kit for configuring the heater ?
If understand correctly, the Easystart Pro only requires the 4 way connector connecting. The remaining 5 unterminated wires are not required?