Перекройте воду и вызовите сантехника, чтобы устранить протечку.

This is the imperative form: it means shut off and call.

The ending -йте can mean either:

• plural you: speaking to more than one person
• polite/formal singular you: speaking respectfully to one person

So Перекройте воду и вызовите сантехника can mean:

• You all, shut off the water and call a plumber
• Please shut off the water and call a plumber

In Russian, the same form is used for both.

Перекрыть воду is the normal Russian expression for shut off the water.

It usually means stopping the flow by turning off a valve or supply.
So in a plumbing/emergency context, перекрыть воду is more natural than закрыть воду.

• перекрыть воду = shut off the water supply
• закрыть usually means close in a more general sense

A native English speaker may want to translate directly from close the water, but Russian normally uses перекрыть here.

Because вода is the direct object of перекройте, so it must be in the accusative case.

• nominative: вода
• accusative: воду

So:

• вода = water
• перекройте воду = shut off the water

This is a very common pattern in Russian: the thing directly affected by the verb often goes into the accusative.

Because сантехник is also a direct object, and it is an animate masculine noun.

For animate masculine nouns, the accusative singular looks like the genitive singular:

• nominative: сантехник
• accusative: сантехника

So:

• вызовите сантехника = call a plumber

This is an important Russian pattern:

• Я вижу стол → inanimate masculine, accusative = nominative
• Я вижу брата → animate masculine, accusative = genitive-like form

Since a plumber is a person, Russian uses сантехника here.

They are perfective:

• перекрыть → перекройте
• вызвать → вызовите

Russian often uses the perfective imperative when telling someone to do a specific action and get it done.

So here the meaning is roughly:

• shut off the water
• call a plumber

with the idea of a completed result.

If you used the imperfective instead, the nuance could be different—more about process, repetition, or a general instruction. In an urgent practical instruction like this, perfective is very natural.

Yes, вызовите can look identical to the 2nd person plural future of a perfective verb:

• Вы вызовете сантехника = You will call a plumber
• Вызовите сантехника! = Call a plumber!

You tell the difference from context and intonation/punctuation.

In this sentence, it is clearly imperative because:

• it appears together with another command: Перекройте воду
• the whole sentence is giving instructions
• there is no subject вы
• the meaning is directive, not predictive

So here it means Call a plumber.

Чтобы here means in order to / so as to.

So:

• вызовите сантехника, чтобы устранить протечку = call a plumber to fix the leak = call a plumber in order to eliminate the leak

This is a very common structure in Russian:

• чтобы + infinitive = in order to ...

Especially when the purpose is general or the same person is understood.

Examples:

• Я пришёл, чтобы помочь. = I came to help.
• Откройте окно, чтобы проветрить комнату. = Open the window to air out the room.

Устранить means eliminate, remove, or fix a problem.

In this context, устранить протечку means:

• fix the leak
• eliminate the leak
• stop the leak by repairing the cause

It is also perfective, so it focuses on the result: the leak gets dealt with successfully.

This is a slightly formal or standard practical word. In everyday English, you would often translate it simply as fix.

Because протечка is the direct object of устранить, so it goes into the accusative case.

• nominative: протечка
• accusative: протечку

So:

• протечка = a leak
• устранить протечку = fix/eliminate the leak

This follows the same pattern as воду above: feminine nouns in -а usually change to -у in the accusative singular.

Yes. In standard Russian punctuation, чтобы introduces a subordinate clause of purpose, so it is separated by a comma.

That is why you write:

• Перекройте воду и вызовите сантехника, чтобы устранить протечку.

The comma marks the purpose part: in order to fix the leak.

The word order can change, because Russian word order is fairly flexible. But this version is very natural and clear.

Current order:

• Перекройте воду и вызовите сантехника, чтобы устранить протечку.

This sounds like a practical sequence:

1. shut off the water
2. call a plumber

You could also say:

• Вызовите сантехника и перекройте воду...

But that changes the emphasis and may sound less logical in an emergency, because shutting off the water is usually the first urgent step.

So the given word order is not the only possible one, but it is a very sensible and idiomatic one.