  A search for dark matter line-like signals was performed in the vicinity of
the Galactic Centre by the H.E.S.S. experiment on observational data taken in
2014. An unbinned likelihood analysis was developed to improve the sensitivity
to line-like signals. The upgraded analysis along with newer data extend the
energy coverage of the previous measurement down to 100 GeV. The 18 h of data
collected with the H.E.S.S. array allow one to rule out at 95% CL the presence
of a 130 GeV line (at $l = -1.5^{\circ}, b = 0^{\circ}$ and for a dark matter
profile centered at this location) previously reported in Fermi-LAT data. This
new analysis overlaps significantly in energy with previous Fermi-LAT and
H.E.S.S. results. No significant excess associated with dark matter
annihilations was found in the energy range 100 GeV to 2 TeV and upper limits
on the gamma-ray flux and the velocity weighted annihilation cross-section are
derived adopting an Einasto dark matter halo profile. Expected limits for
present and future large statistics H.E.S.S. observations are also given.
