Now I'm fairly sure that you can't heal constructs (along with pretty much every other player and DM), but when I went looking for the actual rules I couldn't find them. Nor could I find anything classifying constructs as objects. So this isn't about RAI, this question is about RAW.
Positive and Negative Energy: Negative energy attacks a creatures life force and is typically dealt by undead or necromantic effects. Positive energy instills a surge of life energy which typically heals living creatures but damages undead creatures. While it is referred to as "energy" energy resistance typically isn't effective against either of these types of energy.
This is an editors note and therefore non binding.
Construct Traits doesn't say explicit that they are objects, as there is a secondary definition that says they are creatures. Nor does the bit about healing say that healing spells do not work (and healing spells do not say that they speed up the targets own healing). On a second check, I'm only just convinced that an animated object is not a creature.
- A construct is an animated object or artificially created creature.
- Cannot heal damage on its own, but often can be repaired via exposure to a certain kind of effect (see the creature's description for details) or through the use of the Craft Construct feat. Constructs can also be healed through spells such as make whole. A construct with the fast healing special quality still benefits from that quality.
The best that we get from here is a vague implication that they have to be healed by special spells, but its not implicit, which is what I'm looking for.
Heal enables you to channel positive energy into a creature to wipe away injury and afflictions.
Heal lacks the "living creature" exclusion that Cure Light Wounds has:
When laying your hand upon a living creature, you channel positive energy that cures
I know that various positive energy effects state "living creature", but I can't actually find the explicit rule the positive energy does not heal constructs (nor can I find the description of positive energy (damage or otherwise)). Does such a rule exist?
Note: The intent is not to lawyer this into a game. I really am trying to find the actual rule because the lack of explicit rule bugs me.
Edit: I will accept 3.5 answers if you cannot find pathfinder ones, though preference will be given to PF answers. Please indicate clearly if your answer is 3.5