This article contains the Troubleshooting Guide for the NV770 Series Shark® DuoClean® Lift-Away® Speed Upright Vacuum. This supports the following product SKUs NV770, NV770C, NV771, NV771BRN, NV771C, NV771QBK, NV771QBL, NV771QHX, NV771QPR, NV771QRD, NV772 and NV772C.