I was initially in favor of 3 votes. Seems logical on a small site. However, see Exhibit A:
Gas oven won't maintain temperature it is set on
As of right now, 2 close votes.
One close vote is "Needs details or clarity" - arguably it does need details or clarity. Debatable whether closing a question is a good way to get details or clarity, but that is a larger SE problem, being discussed on alternative sites under development like Codidact But it definitely "fits" within the StackExchange context.
The other close vote is "off-topic because operation of major appliances is listed as off-topic" The problem though is that if you read the question it should be fairly clear that the problem is the oven is not operating as expected - i.e., something is broken. So it isn't "operation" but rather "repair" or "troubleshooting".
Now anyone can make a mistake plus these definitions are often open to interpretation. But with only 3 votes to close, that would mean just one more quick click by someone and poof it is closed. And then we likely lose a new user. Hopefully OP would then go on to ask someplace else and hopefully get the right answer (whatever that may be, as we need details first to figure it out for them). But then again, they may end up someplace else and not get the right answer. And they likely won't come back when they have other questions (with more details and on-topic).
Bottom line: I think 3 votes is too few for our site.