The formation of the 7He heavy isotope has been studied in the 11B(π−, pt)7He, 11B(π−, dd)7He, and 10B(π−, pd)7He reactions of absorption of stopped π− mesons. No indications of the existence of a low-lying level with Ex ∼ 1 MeV have been obtained in any of the three reactions. The existence of three narrow states with excitation energies Ex = 3.1(1), 4.90(15), and 6.65(15) MeV has been proven. Highly excited states with Ex = 16.9(5) MeV, Γ = 1.0(3) MeV, Ex = 19.8(3) MeV, Γ = 1.5(3) MeV, and Ex = 24.8(4) MeV, Γ = 4.6(7) MeV have been identified.