Trouble with Trane TZEMT400AB32MAA Thermostats

Hello fellow homebridgers,

I had some time tonight to install Homebridge 2.0 and everything seems to be working fine except for thermostats. I have two Trane TZEMT400AB32MAA z-wave t-stats in my environment and both are set to fahrenheit in Indigo. My Homebridge config.json file contains the line, "thermostatsInCelsius": false,", but both thermostats still display their values in celsius in my HomeKit app. Also, the "Temperature Display Units" toggle is set to "Fahrenheit" in the app – changing that to celsius has no effect.

Anyone experienced this or have some thoughts on a fix?

Thanks in advance!

Hello fellow homebridgers,

I had some time tonight to install Homebridge 2.0 and everything seems to be working fine except for thermostats. I have two Trane TZEMT400AB32MAA z-wave t-stats in my environment and both are set to fahrenheit in Indigo. My Homebridge config.json file contains the line, "thermostatsInCelsius": false,", but both thermostats still display their values in celsius in my HomeKit app. Also, the "Temperature Display Units" toggle is set to "Fahrenheit" in the app – changing that to celsius has no effect.

Anyone experienced this or have some thoughts on a fix?

Thanks in advance!

HomeKit defaults to celsius for all temperature values. Apparently, Apple's intention for the Temperature Display Unit characteristic is to allow you to change the units that are displayed on the device itself, not the displayed units in the HomeKit app. I don't know why Apple doesn't take your iOS locale settings into account when displaying the value - that would be the obvious thing to do.

For what it's worth, the latest version of the Home app has a preference that lets you choose whether it displays Fahrenheit or Celsius for temperature values (a feature I asked the developer to add because of this very issue.)

-Mike

Mike -

Thanks for the quick reply. I am using Apple's HomeKit Catalog app (https://developer.apple.com/library/prerelease/ios/samplecode/HomeKitCatalog/Introduction/Intro.html) to manage devices. Interestingly, the fahrenheit/celsius characteristic has no effect on the device's display or inside HomeKit Catalog. We'll just chalk this up to HomeKit Catalog being pre-release or maybe just some Homebridge oddities.

Just to confirm: are you saying this app, Home (https://itunes.apple.com/us/app/home-smart-home-automation/id995994352?mt=8), is able to resolve this? Have you had a chance to test with Bouncing Ball's Home Remote (https://itunes.apple.com/us/app/home-remote/id926193671?mt=8)?

Thanks again for the help and the great home bridge-indigo plugin!

Mike -

Thanks for the quick reply. I am using Apple's HomeKit Catalog app (https://developer.apple.com/library/prerelease/ios/samplecode/HomeKitCatalog/Introduction/Intro.html) to manage devices. Interestingly, the fahrenheit/celsius characteristic has no effect on the device's display or inside HomeKit Catalog. We'll just chalk this up to HomeKit Catalog being pre-release or maybe just some Homebridge oddities.

Just to confirm: are you saying this app, Home (https://itunes.apple.com/us/app/home-smart-home-automation/id995994352?mt=8), is able to resolve this? Have you had a chance to test with Bouncing Ball's Home Remote (https://itunes.apple.com/us/app/home-remote/id926193671?mt=8)?

Thanks again for the help and the great home bridge-indigo plugin!

Yes, that is the Home app I was referring to.

As far as I know, Indigo doesn't provide a way to change between F and C on the thermostat's display, so homebridge-indigo doesn't actually do anything when you change that characteristic. If anyone knows a way to accomplish this through the RESTful API, please share.

I thought Bouncing Ball's Home Remote is an app that talks to Indigo's RESTful API directly - it doesn't use HomeKit, does it?

-Mike

Great - I'll take a look at the Home app.

Re: changing between F and C on this particular model in Indigo, there is an option that allows the user to toggle the thermostat's display between F and C. It works well via the desktop app - not sure if that's a characteristic that can be changed via the RESTful API. Matt/Jay?

After digging deeper into Home Remote, you're right: no HomeKit support in the latest version.

Thanks again!