Markos,or Lou could answer this better than I but here goes.
First,is the airport you are landing at ILS equiped?Check this with the map dropdown.Also,if you are NOT using FMC.Is the relevant ILS frequency and course entered on the centre pedestal?
Are you at the correct altitude and heading for an ILS intercept?
It sounds like you are capturing the LOC,which makes me suspect that there may not be a glideslope at this airport.
Hope this helps.
Ron :-/ :-/