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We report the discovery of a new eclipsing EL CVn-type binary, consisting ofa $\delta$ Sct-type pulsator and a thermally bloated low-mass pre-He whitedwarf (WD). Spectroscopy and time-series $BV$ photometry of V1224 Cas werecarried out. The spectroscopy reveals a spectral type of A3 for the star.Light-curve modelling indicate that V1224 Cas is a short-period detached systemcontaining a possible low-mass WD with an effective temperature of about 9516K. Based on the effective temperature and the surface gravity of the A-typeprimary star from the spectroscopic results, the absolute parameters of thecomponents were estimated as: $M_{P}$=2.16$\pm$0.22$M_{\sun}$,$R_{P}$=3.54$\pm$0.12$R_{\sun}$, $L_{P}$=55.9$\pm$6.9$L_{\sun}$,$M_{S}$=0.19$\pm$0.02$M_{\sun}$, $R_{S}$=0.97$\pm$0.04$R_{\sun}$, and$L_{S}$=6.9$\pm$0.6$L_{\sun}$. We therefore introduce V1224 Cas as a new ELCVn-type binary candidate. The light curves in both filters all showmulti-periodic pulsations, superimposed on binary effects. We performed apreliminary frequency analysis of the light residuals after removing thesynthetic eclipsing curve from the original observational data. The resultssuggest that the rapid light variations among the light curves could beattributed to the $\delta$ Sct-type primary component. We therefore concludethat V1224 Cas is very likely a WD+$\delta$ Sct binary.

V1224 Cas - an EL CVn-type Eclipsing Binary Consisting of a Helium White Dwarf Precursor and a Delta Scuti Pulsator