Hi there. Afraid I'm having a little trouble with the translation here, in figuring out which MC command you are using.

In English, we have:
MC > (Sim) > Advanced > Set Service
This makes a sim into a Service Sim if they aren't already part of the service household and yes, that's going to remove them from a resident household if they were originally a resident.

MC > (Sim) > Advanced > Selectability
This changes a sim into a non-controllable character and back to controllable again but doesn't remove them from a household.

Which one are we talking about, or is it something else? I think I can see where Set Service is going to more deeply affect the sim than just making them non-controllable. We can't socialize with Service Sims while they are busy supplying their services, or on their way to doing so. There's going to me a much deeper impact than simply making them not selectable.

There are two kinds of fire fighters in TS3 and either one can respond to a fire when it happens. One is the Service Sim kind. Service Sims are those that are called or pushed over to your sims' house when needed to perform their services. Service Sims are always by definition homeless NPCs, they are never playable. If we attempt to make a Service Sim playable, they will lose their service assignment immediately. This goes for maids, babysitters, mail/pizza deliverers, the grim reaper, and service sim fire fighters as examples.

Then there is the Ambitions fire fighter career sims. These of course are playable. But we still cannot actively play the firefighter whom the game calls over to take care of a fire that happens in our active household. It just is not set up for that character to be playable.

Have you tried a MasterController Reset on the sim who appears to have become damaged from being switched in and out of some kind of NPC service assignment?

May I ask which game update we are talking about? There hasn't been a game file affecting patch released for TS3 since Patch 1.66 back in Jan 2014. The subsequent 1.67 patch was trivial and 1.69 (Origin for Windows) only changed the way in which the game starts up, not the actual game program files. TS3 hasn't been in active development on the EA end in years.

And if you have only recently patched up, are all of your NRaas mods up to date and intended for your current patch levels?

This could be a language barrier, but I'm detecting that the assistance I am trying to provide by way of sharing mine and other player's experiences is only adding to your frustration and that's not what I want to have happen at all. So once we get the game update question out of the way, I'll step back and let our developer answer on the MC command question when he gets to this thread. It does sound, though, like you have a damaged sim on your hands no matter how he came to be that way and there may not be a good solution to fix this going forward.

So to summarize. You have made a sim into an NPC Service Sim using MC. From that point you had no social menu options with that sim whereas it was all working before. And, correct me if I've got this wrong, then moving them back into the household so that they were no longer a Service Sim did not help and neither does MC Resetting them.

As before, not because of misunderstandings, I'll have to defer to our developer when he reads this as to what the possible causes are that we have not already covered. But I still think you might have a damaged sim there.

If you would like to provide screenshots, the easiest way would be to upload them elsewhere and provide links to them. The wiki supports images embedded in posts, but the wikitext code required to make that work is not always easy to understand. We can't have image files uploaded to the wiki directly because of storage capacity issues.

Okay, I have some results to report here.

1 - Set Service on the actively being played resident sim. I didn't actually do that on purpose, that was by accident. My game session became totally messed up because of course a Service Sim can never be active. I couldn't completely switch back to the remainder of the real household, so gave up on that attempt as that game was going nowhere.

2 - Started over and tried Set Service on another member of the active household (what I meant to do in the first place). And I did get the same results you did. No social actions on the now homeless Service Sim who was still hanging around. But it was more than just that, the sim's MC Status reports were showing that he still had his former career and was a service fire fighter at the same time, which should be impossible.

So I saved, reloaded, and added him back to the household with Add Sim. Still no social interactions, but his Status reports were okay again. MC Reset him, all of the social interactions came back and he was fine as both a member of the household and an actively played sim again. This part here seems to be the key difference, the MC Reset did work as I had hoped it would.

3 - Tried Set Service on a resident sim from a different household, again lost the social interactions.

4 - Tried to Set Service on a sim who was already a homeless Service Sim (to move them to a new department) but the option was not there so apparently the command cannot be used this way.

For Chain, when you get to this thread: So that we don't waste more time testing this command, what is its intent? Are we meant to be using it on resident sims, homeless ones, those just immigrating in, or is it known that unexpected things will keep happening regardless?