I'm not sure if it's the same with changing from Air to coils with the Nanocom but I just had a similar experience when changing the coolant temp setting. I'd change it hit the 'OK' icon and when I checked it had not saved the new setting.
I eventually saw the floppy disk icon which I clicked on and the Nanocom then went into a 'save' mode. When finished I hit the OK icon and the new temp warning level was stored.
Might be worth a try. I'll be interested to hear how you go.
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