New Navien Tankless. Cold line feels hot and hot line feels cold.

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jag2k2

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Apr 19, 2023
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I hired a plumber to install a Navien 240a2. When I run the hot water in one my showers or faucets and then inspect the unit, the line labled "HOT" feels cold and the line labeled "COLD" feels hot to the touch.
all_connections.jpg
The red valve is connected to a terminal that is labeled HOT
hot_closeup.jpg

The showers and faucets are behaving normally (hot water is coming out of the sides I'm used to). If I didn't know any better I would say that water is flowing through the navien backwards. Is that even possible? Did my plumber just swap the hot and cold lines to the house?
 
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