Fableonian

Ok i checked your file and i see why it is not casting.
What i prefer to use is the option "Combat Only" on False. Just so they top off the party also out of combat. (This is not the problem)
For the settings of your heal spells:
You are using "For friends (party)" together with "Cast spell on self" so both on true won't work. You should split them, i explain futher down.
The setting "Is buff" should be on true with friendly spells otherwise your healer won't cast.
Now to have your healer cast on party and on himself you should make 2 spells of the same with different settings.
Party:
- For friends (party) = True
- Is buff = True
- Cast spell on self = false
- Combat only = false
As condition for Party you should use a condition like:
- Target Health Percent
Self:
- For friends (party) = False
- Is buff = True
- Cast spell on = Player
- Cast spell on self = true
As condition for Self you should use a condition like:
- Health Percent
I added your healer profile
Where i adjust the Renew en Flash Heal spell
Those should work now for you healer
 
healer.xml