Something running as in water? or burner? The bypass is on the back of the WH but sometimes they are not installed. You can pick up from camping world or amazon and install it yourself if it is not there there are many pictures of them on this forum (just search) and they are easy to install.
Need some more specifics if we are to be of much help.
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2007 Chevy 2500HD Classic LBZ Duramax/Allison (Stock)
2005 Bigfoot 1500C8.2 AWESOME