Halakhah zu Tehillim 89:16

9. If one did two tekiah-shevarim-teruah-tekiah or two tekiah-shevarim-tekiah or two tekiah-teruah-tekiah appropriately and erred on the third, he only needs to return to the place of error. If one blew into the wide side of the shofar, they have not fulfilled their obligation. Rem"a: After the blasts, the leader says the verse "Happy is the nation that knows blasts" [Psalms 89:16] and "Happy..." [Psalms 145] and they return the Torah scroll.