I seem to recall them simply healing at will though. They weren't commanded into healing. They would just heal occasionally, after being specialized into the healer version.
Before a certain update, the summons did their healing magic whenever they deemed it necessary, and pressing the key the Daedra was bound to actually unsummoned it if already summoned. Which could be rather lethal in the middle of a fight.I seem to recall them simply healing at will though. They weren't commanded into healing. They would just heal occasionally, after being specialized into the healer version.