Fyringsmønsteret endrer seg med fyringsteknikken.

Those endings show the definite form in Norwegian, similar to the in English.

• et fyringsmønster = a firing pattern

• fyringsmønsteret = the firing pattern

• en fyringsteknikk = a firing technique
• fyringsteknikken = the firing technique

Unlike English, Norwegian often puts definiteness at the end of the noun instead of using a separate word like the.

So in this sentence:

• Fyringsmønsteret = the firing pattern
• fyringsteknikken = the firing technique

Yes. Fyringsmønsteret is a compound noun, which is very common in Norwegian.

It can be broken down like this:

• fyring = firing / combustion / heating
• mønster = pattern
• fyringsmønster = firing pattern
• fyringsmønsteret = the firing pattern

Norwegian often combines words into one long noun where English might also use two words.

Fyring comes from the verb å fyre, which can mean things like:

• to fire up
• to heat
• to stoke
• in technical contexts, to combust / burn fuel

So in this sentence, fyring is probably being used in a technical or practical sense related to heating, burning, or combustion.

Exactly how you translate it depends on context, but grammatically it functions as the first part of a compound noun.

Because å endre seg means to change, while å endre usually means to change something.

Compare:

• Jeg endrer planen. = I change the plan.
  Here the verb has a direct object: planen.

• Planen endrer seg. = The plan changes.
  Here the subject itself changes, so Norwegian often uses seg.

In your sentence:

• Fyringsmønsteret endrer seg ...
  = The firing pattern changes ...

So seg helps show that the subject is undergoing the change itself, rather than changing something else.

Seg is a reflexive pronoun. It is used when the action refers back to the subject.

In English, reflexive meanings are sometimes expressed with itself, himself, themselves, etc., but often English simply uses a normal verb:

• Norwegian: endrer seg
• English: changes

So even though seg literally looks like itself/himself/herself, you should not always translate it word-for-word. In many cases, it is just part of the natural Norwegian way of expressing the verb.

Yes, that is possible, but the nuance is a little different.

• endrer seg = changes
• endres = is changed / changes

In many contexts, both can work. However:

• endrer seg often sounds more like the thing changes on its own / undergoes change
• endres can sound a bit more formal, technical, or passive-like

So:

• Fyringsmønsteret endrer seg med fyringsteknikken
  sounds natural and straightforward.

• Fyringsmønsteret endres med fyringsteknikken
  may sound a little more formal or impersonal.

Literally, med often means with, but in this sentence it is better understood as:

• with
• along with
• depending on
• as a result of changes in

So endrer seg med fyringsteknikken means something like:

• changes with the firing technique
• varies depending on the firing technique

This is a very common thing in Norwegian: a preposition may have a broader meaning than its most basic English equivalent.

This is normal main clause word order in Norwegian:

• Subject: Fyringsmønsteret
• Verb: endrer
• Reflexive pronoun: seg
• Prepositional phrase: med fyringsteknikken

So the structure is basically:

Subject + verb + other elements

That is very similar to standard English word order in a simple statement.

The dictionary forms are:

• et fyringsmønster = a firing pattern
• en fyringsteknikk = a firing technique
• å endre seg = to change

If you are learning vocabulary, it is useful to note both the gender and the indefinite form of nouns:

• et mønster
• en teknikk

Then you can form the definite versions:

• mønsteret
• teknikken

Yes. Endrer is the present tense of å endre seg.

• å endre seg = to change
• endrer seg = changes / is changing

In Norwegian, the present tense is often used in general statements, facts, and technical descriptions, just like in English.

So this sentence sounds like a general observation or rule: The firing pattern changes with the firing technique.

Because Norwegian usually marks definiteness by adding an ending to the noun.

So instead of saying:

• the pattern
• the technique

Norwegian says:

• mønsteret
• teknikken

This is one of the biggest differences from English. In many simple cases, the noun ending alone already means the.

Yes. If the noun has already been mentioned, you could replace it with det if the noun is neuter.

Since fyringsmønster is a neuter noun (et fyringsmønster), the pronoun would be det.

For example:

• Fyringsmønsteret endrer seg med fyringsteknikken. Det kan være vanskelig å forutsi.
  = The firing pattern changes with the firing technique. It can be difficult to predict.

That is useful for understanding agreement and reference in longer texts.