Formation of two- and three-pulse electron spin echoes and their anomalous pulse-angle and phase dependence in a photoinduced spin-correlated radical pair are examined. Analytical formulae for the unusual Hahn’s spin-echo signals and the two-pulse double-quantum echo are derived in terms of the pulse angle, microwave phase, and the time intervals between the laser pulse and the microwave pulses. Such anomalies are shown to be present in both cases of singlet and tripler precursors. Phase dependence and formation of the three-pulse stimulated echo and multiple-quantum echoes are also examined.