[Asmodai]

Plasma Guns overheat a silly amount already. No, you don't need to roll since you never actual fire the gun. The Bolters find range for the Plasma if you need a fluff explanation.

I usually lose 3 Plasma Cannon troopers to self-inflicted wounds in a given game anyway, so there's no point making things even more ridiculous.

 

[Asmodai]

Sorry to be rude, but have you payed attention to the last couple of posts. The rules state if it is out of range, it *automatically misses*. this implies that shots have been fired and therefore the weapon can overheat even if not in range

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Let me try to break it down for you.

You automatically miss. You do not roll to hit. Since you do not roll to hit, you cannot roll a one.

I'd love for you to demonstrate how you can roll one or more ones on zero dice.

You're making the classic mistake of confusing fluff with rules.

Read leomunz's post. You check range before rolling to hit. If you're out of range, you don't roll to hit, regardless of what the fluff suggests the rationale for the rule is.

 

[Asmodai]

I think yes you do have to roll to see if it over heats because a similar thing happened to me with my helblaster volley guns in my Empire army.

The Helblaster has its own very different set of special rules. It's a completely different weapon, in a completely different game.

Can you point to the page in the 40K rulebook where it says that Plasma Guns follow the rules for the Helblaster?

If not, I'm not sure that's relevant. It's like saying you automatically win a game of 40K when you kill the army general, because that's what happens when you take out the king in Chess.