Hi,, I know this post is fairly old..
But I'm on same set up...
Mitsubishi ecodan
Danfoss rx1
Danfoss 715 HW + CH
Danfoss tp5000
I bought hive yesterday and got it working 100 percent...
You must remove danfoss 715 and replace with hive unit..
Rx1 stays in place..but cables must be corrected...