Clavinova clp-153sg low volume & no reverbs work

I recently received a Yamaha clavinova clp-153sg that looks and plays well. I have 2 issues (I think). 1.). When the volume is at maximum, it is not very loud. 2.) none of the reverb setting appear to work. When I select one (push the button) it does light up but with no difference in sound. Any thoughts?