Honeywell T5 thermostat not responding after iOS update

I have a Honeywell T5 thermostat and it was working perfect for about a year but after the new iOS update, it stopped responding and I don’t know what to do. I tried everything that was recommended to me online restarting the router factory reset resetting the thermostat resetting/restarting the HomePod and nothing worked. Is this something that Apple needs to fix in the app?



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iPhone 16 Pro Max, iOS 18

Posted on Mar 15, 2025 10:50 AM

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Posted on Mar 15, 2025 02:39 PM

is the thermostat indicating its offline? You’ll need to look at it in its settings or it may just show this on screen.

You don’t say if you have the Honeywell mobile App to use. This would be helpful. If you do, take a look at this video: https://youtu.be/tQruYAKfJG0?si=7CxI32GKzTD3W0Le and read the video comments for other tips.


Other theory is It may have had a firmware update installed on it that is no longer compatible with your wifi. My Ecobee thermostat one day just went offline, turns out it no longer worked with 5G and had to be switched over to my 2.4 GHZ band.



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Question marked as Top-ranking reply

Mar 15, 2025 02:39 PM in response to Miguelb89

is the thermostat indicating its offline? You’ll need to look at it in its settings or it may just show this on screen.

You don’t say if you have the Honeywell mobile App to use. This would be helpful. If you do, take a look at this video: https://youtu.be/tQruYAKfJG0?si=7CxI32GKzTD3W0Le and read the video comments for other tips.


Other theory is It may have had a firmware update installed on it that is no longer compatible with your wifi. My Ecobee thermostat one day just went offline, turns out it no longer worked with 5G and had to be switched over to my 2.4 GHZ band.



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Honeywell T5 thermostat not responding after iOS update

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