I’m hoping someone has seen this before.
My heating is controlled entirely by Home Assistant using the HomeKit Device integration with a tado° V3+ system. I am not using the official Tado integration because of authentication issues, and there are no Tado schedules active.
Everything generally works well except one room.
Problem:
One climate entity (climate.bedroom_3_up) repeatedly becomes Unavailable for a few minutes before reconnecting. It then repeats this throughout the day.
The history looks like this:
- Heat
- Unavailable
- Heat
- Unavailable
- Heat
- Unavailable
(see attached screenshot)
The rest of the HomeKit accessories remain online.
My setup:
- Home Assistant 2026.7.x
- HomeKit Device integration
- tado° V3+ Internet Bridge
- Wired Ethernet network
- mDNS enabled
- Home Assistant Green
- Bedroom 3 Smart Radiator Thermostat
I’ve already tried:
- Restarting Home Assistant
- Restarting the Tado bridge
- Rebooting networking equipment
- Removing and re-adding HomeKit
- Checking Wi-Fi signal (appears OK)
- Confirmed this is only affecting Bedroom 3
Questions:
- Has anyone seen a single HomeKit climate accessory repeatedly become unavailable while the rest remain connected?
- Is this usually a HomeKit/mDNS issue, or is it more likely the individual Tado radiator valve?
- Are there any Home Assistant logs or HomeKit debug logs that are particularly useful for diagnosing this?
Any ideas would be much appreciated.