Your BZX79C2V4L model is broken.
Try:
.model BZX84C2V4L D(Is=2n Rs=.5 Cjo=200p nbv=3 bv=2.4 Ibv=1m Vpk=2.4 mfg=OnSemi type=Zener)
Try:
.model BZX84C2V4L D(Is=2n Rs=.5 Cjo=200p nbv=3 bv=2.4 Ibv=1m Vpk=2.4 mfg=OnSemi type=Zener)
Theres a good tutorial and lots pf help in driving LTSpice at Installing and using LTspice IV (now including LTXVII). From beginner to advanced.