my healer attack instead of healing in raids

hello everyone..

I have a problem that I cant overcome for long time now. my priest is a healer in LFR and I used so many Routines like King-WoW and Singular and many other. all of them are good but,,,, they are not making my Priest heal, istead, he Smite and Peanace for attack not for heal. he use his damage untill he oomed and cant do anything. I become oom very fast like in 30 sec because of his spam.

I thought he use Smite to get the Archangel, but he kept using it after he got 5 Archangel.

how can I make him only heal, without any damage, or at least he damage for the Archangel ?


thank you