I’ve found with both my rapid cools when I put the hot water in it initially goes amber but then within 10 seconds it turns green when it’s not cool enough to drink. I tried with the extra one and that was the same too. Anyone else found the same?
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Yeah I've found exactly the same. I just ignore the colour now and leave it for a few minutes and it's been fine but it's still annoying it doesn't work properly xx

I just set a timer for 2 mins and it’s usually done!

I don’t use the colours at all, just leave it for a good few minutes x

Mine has only ever showed green. Even when not in use it’s green. I have found it works great though(lid aside) x

I shake mine and it’s ready straight away x

Mines only ever showed amber once always just green, I turn mine upside down and few times and just wait a couple mins and it’s perfect x

I bought one yesterday and noticed this. So so I right in thinking it will still cool even if it’s not been activated again xx

yes the flask still works even if the lid stops working - but the flask won’t cool as effectively again within a 3 hour time frame. I have two and alternate mine x

Yes I’ve left it for four mins and then it’s fine. I’m thinking of chucking the perfect prep machine and just alternating the two nubys I have so one will always be ready x