Erişim saatleri haşere kontrolü için değiştirildi.

In erişim saatleri, saatleri means hours as part of a noun phrase meaning access hours.

The ending -leri can look confusing, because it may suggest different things in Turkish. Here, the phrase is best understood as a common Turkish noun compound:

• erişim = access
• saatleri = its hours / the hours of access

So erişim saatleri literally works like access hours or the hours for access.

This pattern is very common in Turkish:

• okul kapısı = school door
• şehir merkezi = city center
• haşere kontrolü = pest control

In English, we often put two nouns together directly. In Turkish, the second noun usually takes a special ending in this kind of construction.

For the same reason as erişim saatleri: this is another noun compound.

• haşere = pest, vermin
• kontrolü = its control / control of

So haşere kontrolü means pest control.

In Turkish, noun compounds often work like this:

• first noun stays plain
• second noun takes a compound ending, often called the 3rd person possessive ending

Examples:

• su şişesi = water bottle
• otobüs durağı = bus stop
• telefon numarası = phone number

So haşere kontrolü is the normal Turkish way to say pest control.

Here için means for.

So:

• haşere kontrolü için = for pest control

In this sentence, it gives the reason or purpose for the change. Depending on context, English might translate it as:

• for pest control
• because of pest control
• due to pest control

So için is flexible, but for is the most direct match here.

Because değiştirildi means was changed, while değişti means changed or became different.

This is an important difference:

• değişmek = to change, to become different
• değiştirmek = to change something, to alter something

Then:

• değişti = it changed
• değiştirildi = it was changed

In your sentence, the hours did not simply change by themselves. Someone changed them. That is why Turkish uses the passive form değiştirildi.

It can be broken down like this:

• değiş- = change
• -tir- = causative, making it change something
• -il- = passive, making it be changed
• -di = past tense

So:

• değişmek = to change
• değiştirmek = to change something
• değiştirilmek = to be changed
• değiştirildi = was changed

This is a very common Turkish pattern, especially in formal notices and announcements.

There is no separate word here for were.

In Turkish, tense and voice are usually built into the verb itself. So değiştirildi already includes the idea of:

• past tense
• passive voice

That is why one Turkish word can correspond to several English words:

• değiştirildi = was changed
• with a plural subject in English: were changed

Turkish does not need a separate verb like English was/were in this sentence.

Because Turkish often does not mark plural agreement on the verb when the subject is already clear.

The subject here is erişim saatleri = access hours, which is plural in meaning, but the verb stays in the basic 3rd person form:

• değiştirildi = was/were changed

This is completely normal in Turkish. Turkish does not handle subject-verb agreement the same way English does.

So even though English says hours were changed, Turkish naturally says:

• saatleri değiştirildi

without needing a special plural form on the verb.

Yes, that alternative is also natural.

Turkish word order is flexible, especially with time, reason, and purpose phrases. Both of these are fine:

• Erişim saatleri haşere kontrolü için değiştirildi.
• Haşere kontrolü için erişim saatleri değiştirildi.

The second version may sound a little more like an announcement, because it puts the reason first:

• For pest control, access hours were changed

The original sentence is also perfectly natural.

It can be used more generally.

erişim means access in many contexts, including:

• physical access to a building or room
• access to a service
• access to a website or system
• access rights or availability

So erişim saatleri could mean:

• the hours when a place can be entered
• the hours when a system or service is accessible

The exact meaning depends on context.

Yes, it sounds fairly formal and typical of notices, building announcements, or administrative messages.

Turkish often uses passive forms like değiştirildi in formal writing because they sound neutral and official. Compare:

• Erişim saatleri haşere kontrolü için değiştirildi. = formal, notice-like
• Haşere kontrolü yüzünden erişim saatlerini değiştirdik. = more direct, conversational, We changed the access hours because of pest control

So your sentence is the kind of wording you might see on a sign, in an email, or in a public announcement.