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dabovskiy · 04-03-2022

Hello all, need a little help with this one. I’ve got an “older” Trane XV80 system (2015) The existing tstat only ran 4 wires (Y, W, G, R) and it was working fine.I installed a Nest with an external 24v adapted but it's giving me an error "N72" - no ...

dabovskiy · 04-09-2022

That didn’t work, but I found the actual issue. So I just said F-it and rewired it with a new tstat line thinking that will solve the problem, but it gave me the same error. Called tech support and was told to switch from Rh to Rc, did that and the e...

dabovskiy · 04-03-2022

I didn’t take a pic when I had the Nest installed, but the current terminals in use are: W, Y, G, Ron the nest I had:W1, Y1, G, Rh - plus from the external 24v power source: C, Rc

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N72 error

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