DSCOVR actually is in a "halo orbit" around L1, which means it's not sitting in the plane of the Earth-Sun orbit. From the DSCOVR site[1]: "The spacecraft will be orbiting [L1] in a six-month orbit with a spacecraft-Earth-sun angle varying between 4 and 15 degrees."
As some other folks have mentioned, the Moon's orbit is tilted a total of 5.2 degrees[2] relative to the Earth-Sun plane, so DSCOVR will see quite a number of DSCOVR-Moon-Earth alignments, but never a Sun-DSCOVR-Moon-Earth alignment.
As some other folks have mentioned, the Moon's orbit is tilted a total of 5.2 degrees[2] relative to the Earth-Sun plane, so DSCOVR will see quite a number of DSCOVR-Moon-Earth alignments, but never a Sun-DSCOVR-Moon-Earth alignment.
[1] http://www.nesdis.noaa.gov/DSCOVR/
[2] http://hyperphysics.phy-astr.gsu.edu/hbase/solar/solecl.html