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The A/F-type stars and pulsators ($\delta$ Scuti-$\gamma$ Dor) are in acritical regime where they experience the transition from radiative toconvective transport of energy in their envelopes. Such stars can pulsate inboth gravity and acoustic modes. Hence, the knowledge of their fundamentalparameters along with their observed pulsation characteristics can help inimproving the stellar models. When residing in a binary system, these pulsatorsprovide more accurate and less model dependent stellar parameters than in thecase of their single counterparts. We present a light curve model for theeclipsing system KIC 6048106 based on the \textit{Kepler} photometry and thecode PHOEBE. We aim to obtain accurate physical parameters and toughconstraints for the stellar modelling of this intermediate-mass hybridpulsator. We performed a separate modelling of three light curve segments thatshow a distinct behaviour due to a difference in activity. We also analysed the\textit{Kepler} ETVs. KIC 6048106 is an Algol-type binary with F5-K5components, a near-circular orbit and a 1.56-d period undergoing variations ofthe order of $\frac{\Delta P}{P}\simeq 3.60\times10^{-7}$ in $287\pm7$ days.The primary component is a main-sequence star with$M_{1}=1.55\pm0.11M_{\odot}$,~$R_{1}=1.57\pm0.12R_{\odot}$. The secondary is amuch cooler subgiant with $M_{2}=0.33\pm0.07M_{\odot}$,~$R_{2}=1.77\pm0.16R_{\odot}$. Many small near-polar spots are active on its surface. Thesecond quadrature phase shows a brightness modulation on a time scale $290\pm7$days, in good agreement with the ETV modulation. This study reveals a stablebinary configuration along with clear evidence of a long-term activity of thesecondary star.

KIC 6048106: An Algol-type Eclipsing System with Long-term Magnetic Activity and Hybrid Pulsations. I. Binary modelling