We first study the Massera problem for the existence of a −periodic solution for some nondensely defined partial differential equation, where the autonomous linear part satisfies the Hille-Yosida condition and the delayed nonlinear part satisfies a locally Lipschitz condition. Second, inspired by an existing study, we prove in the dichotomic case, for = 1, the existence-uniqueness and conditional stability of the periodic solution. Moreover, we show the existence of a local stable manifold around such solution. Our theoretical results are finally illustrated by an application.