What does the yellow cogwheel mean ? (has replaced green leaf symbol)

[S400]

NB:  No idea WHICH Nest thermostat I've got ... to me a thermostat is a thermostat, and nothing in my android app tells me which type of thermostat I actually have.

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I have just turned down my thermostat to what should be the ECO temperature (17 degrees) but instead of seeing a green leaf symbol, I now (as of today) see a yellow cogwheel symbol.

Only when I turn the thermostat down further to 16.5 degrees does the green leaf symbol appear.

WHAT DOES THE YELLOW COGWHEEL SYMBOL MEAN ?

Why is this not documented ?

[Allyincally]

I have the yellow cog with a leaf in the middle. What is that?

[ebastos22]

Same… I have no idea.

[Wentodd]

I put this question in my search and it says Seasonal savings! You have to go to your history and cancel it if you want! The nest community app was NO help since they never answered anyones question! 

[Wentodd]

I put this question in my search and it says Seasonal savings. You have to go to your history and cancel it if you want! The nest community app was NO help since they never answered anyones question!