The activation energies of acceptor and donor defect states in the ordered defect compound CuIn3Se5 are calculated by using a simple model based on the effective-mass theory for single, double and triple point defect centers. It is found that the values of these energies for both shallow and moderately deep levels are in reasonable agreement with those determined from experimental data. From the analysis of the results, a tentative assignment of the origins of these centers has been made. (C) 2002 Elsevier Science B.V. All rights reserved.