トイレが詰まったって英語でなんて言うの？

I can't flush the chain.

It is common to say that the toilet is blocked or that it cannot flush.
You can also say:
Can someone come and fix the toilet please? It appears to be blocked.

I hope this helps!

The important thing is to have a functioning toilet immediately!

You can use the above statements to express yourself. Assist is another word for help. So you can use them interchangeably.

The toilet is broken can you send up maintenance? - if you want to call to reception and you are above the reception.
The toilet will not flush, can you sort it out please? If you speak to someone face to face about it. Sort it out means fix.

When in a establishment such as a bar / restaurant / hotel etc, and the toilet you may or may not have been using is not working / not flushing, (flushing, the acts of taking away whatever is in the toilet), you will use these expressions, often saying this to the staff members and / or the care takers (those who look after the place).

>Hi, can your maintenance staff please come fix the toilet.
*Maintenance staff=staff that see to the daily repairs to broken things in the building.

>The toilet can't flush and I need someone to urgently come fix it or can I be moved to another room.
*This is asking for someone to come fix the toilet or you would rather be moved to a room where the toilet works properly.

1. "The toilet is broken, can you please fix it."
   This is a polite and direct request, asking that the broken toilet be fixed.

2. "I need to use the ladies room/men's room but it won't flush."
   The ladies' room is used to describe the toilet used by females. The men's room is used to describe the toilet used by males.

If you want to explain to somebody that the toilet is clogged, and you want somebody to come fix it, you can say:
"The toilet is clogged, can you please fix it?"
"The toilet doesn't seem to be flushing."

There are a few expressions you can use in this situation.

Examples :

There is a problem with the toilet. Can you please fix it?
The toilet won't flush. Could you please help me?
The toilet is clogged up. Will you fix it please?
The toilet is blocked .Can you please fix it?
There is something wrong with the toilet. I need help please.

I hope this helps :)

"The toilet is blocked, could you please come and unclog it?" is asked when something has blocked the toilet and it is preventing the toilet from flushing the waste down. If too full the toilet could overflow.