We explore the discovery potential of doubly charged Higgs bosons (ξ⊃±⊃±) at the CERN Large Hadron Collider (LHC). For moderate values of the coupling constants in the original Type-II seesaw model, these doubly charged Higgs bosons are not accessible at any present or near future collider experiments. In a gauged B-L symmetric model we introduce two triplet scalars to execute a variant of type-II seesaw at the TeV scale. This leads to a clear like-sign dilepton signal in the decay mode of ξ⊃±⊃± for a small vacuum expectation value (105eV) of the triplet scalar ξ=(ξ⊃++,ξ⊃+,ξ0) of mass 1TeV. To be specific, for a mass range of 200-1000 GeV of ξ⊃±⊃±, the like-sign dilepton signal can be detected at CERN LHC at a center of mass energy 14 TeV with an integrated luminosity, say, 30fb-1. The same analysis is also pursued with center of mass energies 7 TeV and 10 TeV as well. We also comment on the decay mode of singly charged scalars and the neutral B-L gauge boson in this model. © 2010 The American Physical Society.