The doubly charged Higgs bosons H_1,2^±± would undoubtedly be clear messengers of the new physics. We discuss their mass spectrum and show how experimental data and relations between scalar masses put limits on it. In particular, both the masses of the particles H_1^0, A_1^0 that play a crucial role in FCNC effects and the masses of the additional gauge bosons W_2, Z_2 are notably important. For instance, if M_H_1^0,A_1^0≃ 15 TeV and M_W_2≃ 3.76 TeV then the lowest mass of H_1^±± is 465 GeV. In

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... contrast, due to the freedom in the parameter space of the full scalar potential, there is no lowest limit on the mass of H_2^±±. It is shown to which signals at hadron colliders such relatively light doubly charged scalars might correspond. LHC working at √(s)=14 TeV will enter into the region where existence of such particles with minimal masses can be thoroughly explored for a much wider parameter space of the minimal and manifest version of the left-right symmetric model (MLRSM). Taking into account our considerations and present ATLAS and CMS exclusion limits on M_H^±±, there exist already first partial bounds on some of the MLRSM scalar potential parameters.