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Meross MTS300 controls and sensors (lemmy.today)

submitted 2 months ago* (last edited 1 month ago) by paequ2@lemmy.today to c/homeassistant@lemmy.world

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I got the Meross Smart Matter+Wi-Fi Thermostat MTS300 US running today.

In case anyone is curious about what gets exposed to Home Assistant, here it is!

The installation was some what haphazard. I think I was supposed to install with the Meross app. But I'm not sure if that actually was needed. I think I installed via scanning the Matter code in Home Assistant... and then later it appeared in the Meross app. 🤷

The Meross app exposes fan controls. Also child lock. You can also create a schedule in the Meross app. None of these features are visible in HA. (Also cannot control display brightness via HA. Sad.)

Side question: how do y'all create a schedule for your thermostats? I feel like I shouldn't use Meross' scheduling features and I should keep all the smarts in HA, right? I guess I should create Automations and trigger them based on time of day?

Update 12 Nov 2025

Meross released new firmware! I updated my (now 2) thermostats to firmware 9.1.14.1.2.2 and I have fan control now!!! 🥳

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[–] swizzlestick@lemmy.zip 3 points 2 months ago

Depends how you want to use it.

We don't have set schedules because utility prices are insane. Instead:

Manual control as desired by setting thermo, with shortcut buttons for set temps
Button to blast the heating for an hour regardless of temperature and cut off afterwards
Presence detection to shut it off if it's on when there are no users home (also lights)
Watchdog to turn off and keep trying to turn off if heating has been on too long or without demand. Can happen if something sticks or drops off

[–] CompactFlax@discuss.tchncs.de 2 points 2 months ago* (last edited 2 months ago)

I run all the scheduling in the thermostat, because I lose automatic recovery and some aspects of Thresholding, and the rest of the family doesn’t use HA. However, I can’t set certain items (for example, how often the fan runs) in the thermostat’s schedule so I automate those portions with HA.

Matter has limitations, and may not include all the capabilities you want exposed.

For the scheduling it’s basic. Wake, sleep, work, weekends. I have some settings for my high rate time periods as well, and use Proximity for setting the away thermostat.

Meross’s own FAQ addresses why you need to use their app for setup - it’s so that you can tell it what kind of system you have. It’s fairly important.

[–] Vinny_93@lemmy.world 1 points 2 months ago* (last edited 2 months ago)

I have a template called Advanced Heating Control v5 which works like a charm. Only thing in struggling with is that my TRVs can't control the boiler so they only receive hot water once the temperature in my living room drops below my comfort temp.

https://community.home-assistant.io/t/advanced-heating-control/469873