Electrical – Outlets no longer controlled by switch

electricalreceptacleswitch

When we moved in we replaced all outlets with Tamper Resistant ones.
We had an outlet on the left side of room that was half controlled by a switch. We wanted both outlets controlled so we left the little tab. It worked fine for a month or so.
When we moved a dresser on the right side of the room we noticed an outlet had gotten forgotten so we replace it (it had not been controlled by the switch and was always hot.) As soon as it was replaced the outlet on left side of room stopped being controlled by the switch and is always hot.

How do we fix that?
Over time we have found other switches that control nothing and wonder if it is a similar situation.

Best Answer

Well, since you already know all about tabs, I don't need to give the usual "what is a tab" orientation. You were on guard, and didn't make the usual mistake.

Except you did this time. This receptacle you just changed was split, with its tab broken off. You need to do that on the new one.

Or instead, you can simply disconnect and cap whichever hot (always or switched) you do not want, but you've already done that so you know the drill.