Wir notieren den Fehlercode und setzen die Wärmepumpe zurück.

Wir means we and is the subject of the sentence.

So the basic structure is:

• Wir = subject
• notieren = verb
• den Fehlercode = object

Then the sentence adds a second action:

• und setzen die Wärmepumpe zurück = and reset the heat pump

Both verbs, notieren and setzen ... zurück, belong to the same subject, wir.

Because Fehlercode is the direct object of notieren, so it is in the accusative case.

Fehlercode is masculine, so its article changes like this:

• nominative: der Fehlercode
• accusative: den Fehlercode

That is why the sentence says den Fehlercode.

Because Wärmepumpe is a feminine noun, and for feminine nouns, the article is the same in both nominative and accusative:

• nominative: die Wärmepumpe
• accusative: die Wärmepumpe

So even though it is also a direct object here, the form stays die Wärmepumpe.

Because zurücksetzen is a separable verb.

Its full dictionary form is zurücksetzen, but in a normal main clause, the prefix separates:

• Wir setzen die Wärmepumpe zurück.

So:

• setzen = the conjugated verb part
• zurück = the separated prefix, placed at the end

This is very common in German with separable verbs, for example:

• Ich rufe dich an. = I call you up / I call you
• Wir schreiben die Nummer auf. = We write the number down

Literally, yes, it looks like set back, but here the meaning is reset.

So:

• die Wärmepumpe zurücksetzen = to reset the heat pump

This is a good example of why you should learn many German verbs as complete units, especially separable ones. The literal parts help sometimes, but the real meaning in context may be a bit different.

In a German main clause, the conjugated verb usually comes in the second position.

In the second part of the sentence, the subject wir is understood from the first part, so German does not repeat it:

• Wir notieren den Fehlercode und setzen die Wärmepumpe zurück.

After und, the second verb phrase continues naturally:

• setzen = conjugated verb
• die Wärmepumpe = object
• zurück = separable prefix at the end

You could also repeat the subject, but it is usually unnecessary here:

• Wir notieren den Fehlercode und wir setzen die Wärmepumpe zurück.

That sounds more repetitive.

Because the subject is wir.

For regular present-tense verb endings in German:

• ich = -e
• du = -st
• er/sie/es = -t
• wir = -en
• ihr = -t
• sie/Sie = -en

So:

• wir notieren
• wir setzen

That is why both verbs appear with -en.

Not exactly.

• notieren means to note down, to write down, or to record
• schreiben more generally means to write

In this sentence, notieren den Fehlercode suggests recording the error code, for example in a log, on paper, or in a system. It sounds slightly more precise and procedural than just schreiben.

It is a compound noun, which is very common in German.

It is made from:

• Wärme = heat
• Pumpe = pump

Together:

• Wärmepumpe = heat pump

German often combines nouns into one longer word. The last part usually determines the grammatical gender, and Pumpe is feminine, so Wärmepumpe is also feminine: die Wärmepumpe.

Because all German nouns are capitalized.

So in this sentence:

• Fehlercode is a noun
• Wärmepumpe is a noun

That is why both begin with capital letters.

Yes. It is in the present tense.

• wir notieren = we note / we are noting
• wir setzen ... zurück = we reset / we are resetting

In German, the present tense is used very often, including for:

• general statements
• current actions
• instructions in manuals or procedures

So in a technical context, this sentence can sound like a step in a procedure: We note the error code and reset the heat pump.

The dictionary forms are:

• notieren = to note down / record
• zurücksetzen = to reset

In the sentence, notieren looks the same as the dictionary form because wir uses the -en ending.

But zurücksetzen changes in the sentence because it is separable:

• dictionary form: zurücksetzen
• sentence form: setzen ... zurück

The ä changes the vowel sound.

In Wärme, the ä is pronounced roughly like the e sound in bed for many learners, though exact pronunciation depends on accent and phonetics.

So:

• Wärme is not pronounced like Warme
• the umlaut changes the sound and can also distinguish words

This matters because umlauts are not just decoration in German; they are part of the spelling and pronunciation of the word.