אורח חיים קמ״בOrach Chayim 142

Se’if 1א׳

קָרָא וְטָעָה, אֲפִלּוּ בְּדִקְדּוּק אוֹת אַחַת, מַחֲזִירִין אוֹתוֹ. הַגָּה: וְכֵן דִּין הַחַזָּן הַקּוֹרֵא; וְדַוְקָא שִׁנּוּי שֶׁמִּשְׁתַּנֶּה עַל יְדֵי זֶה הָעִנְיָן, אֲבָל אִם טָעָה בִּנְגִינַת הַטַּעַם אוֹ בַּנִּקּוּד, אֵין מַחֲזִירִין אוֹתוֹ, אֲבָל גּוֹעֲרִין בּוֹ (בֵּית יוֹסֵף וּפִסְקֵי מהרא"י סִימָן קפ"א).

The Law of One Who Read and Erred, And a Place Where There is No One Who Knows How to Read [Torah] Precisely. Containing 2 S'ifim: One who read and erred, even in the pronunciation of one single letter, we make [the reader] go back [and read again]. Gloss: The same law applies to the chazzan [i.e. the one who reads for others] who reads. And [this is all] specifically [in regards to] a change which alters the meaning [of the word], but if [the reader] erred in the melody of the cantillation or the vowelization [that does not alter the meaning], we do not make [the reader] go back, but we do rebuke [the reader]. (Beit Yosef and Piskei Maharia, Siman 181)

Se’if 2ב׳

וְיִשּׁוּב שֶׁיֵּשׁ שָׁם מִנְיָן וְאֵין מִי שֶׁיּוֹדֵעַ לִקְרוֹת בַּתּוֹרָה כְּהִלְכָתָהּ בְּדִקְדּוּק וּבִטְעָמִים, אֲפִלּוּ הָכֵי יִקְרְאוּ בַּתּוֹרָה בִּבְרָכָה, כְּהִלְכָתָהּ. וּמַפְטִירִין בַּנָּבִיא וְעַיֵּן בְּסָמוּךְ רֵישׁ סי' קמ"ג.

A place that has a minyan [a quorum of 10], but there is no one that knows how to read from the Torah according to its laws precisely and with the [correct] cantillation; nevertheless, they should read from the Torah with the blessings as per its laws. (And they conclude [i.e. read the Haftarah] from the Prophets. And see further in the beginning of Siman 144)