retromike,
Had same problem. This is what Camping World put on our work order for the same issue to solve it.
Shower drain is running up hill causing shower to drain slowly or not at all. Remove paneling under shower to gain access to shower drain. Remove access panel under sink, cut out plumbing to tank and shower drain RE plumb so it drains down hill to drain properly.
Since they did this our shower is draining finally.
Good luck with your Thor and I pray this is your only issue.
Which Camping World do you use. I am not impresssed with them at all.
Would love to find a Thor authorized service center close to us.
Ratboy
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