I use a LG 2MDHC. are you running them dry or with liquid? never run them dry!!!!!!! try them as a dry run but with water (confusing I know lol) - fill a bucket/brewpot with water, open valve, connect pump and let it rip. hopefully it works, if not bummer. hopefully running them dry hasn't hurt anything. if it has then don't tell anyone you were running it dry!!
set I: Pale (3) -> Mild (4-5) -> amber / Victory (20-25) -> special roast (40-50) -> brown (70)
set II: pilsner (2) -> Vienna (3-4) -> Munich (8-10) -> dark Munich (20) -> aromatic / melanoiden (25-30)
encore: smoked (5)