Reconnect known device

I have a general question about how things works behind the scene! If I have a device properly configured on which I've created some rule (Philips motion sensor). This morning, it seems to have lost connection to the hub (it flash red).

I am wondering at that point :
1- Do I need to delete the rules, delete the device, recreate everything from scratch
2- Can I add a new device and since the device has a known ID, the system will replace the existing information with this new device information and everything will still work without a change?
Another way to proceed?


All Zigbee-devices (there amongst Hue) already included can just be re-paired without any previous deletion, this will not break the existing rules where the device is used. Z-wave on the other hand will be a totally different matter!

Edit: And welcome to the community! :slightly_smiling_face:


The C-7 has the ability to replace ZWave devices.

Zigbee have factory set hard coded Node Numbers. They never change and thus once its paired to a hub, its identity is known. This allows it to be a "device previously known." to the hub, and get dropped right back into that known spot. However, Zigbee doesn't have a replace... if the device actually dies and you buy a replacement, the device will pair as a never-before-seen.

On the ZWave Details page devices is a stack of buttons for each device. Ideally you want the stack to be Refresh and Repair:

Screen Shot 2021-11-15 at 6.39.03 AM

ZWave has a replace option and it can be used to reuse a node number. More steps though...

Screen Shot 2021-11-15 at 6.32.25 AM

Just click the Replace button and the Hub goes into Replace mode. IT's 90% the same as an Include, but it reuses an existing Node Number [0x0F (015)] in this example case. The physical device is then put into Join and as if by magic, the Replace is complete.

For completeness, I'll remind the reader that Include only works with previously Excluded devices. If you are in fact, replacing an existing device with the same physical device, you need to externally factory reset it before starting the Replace process. I have an Aeon Z-Stick for that... it's not joined to any of my ZWave networks and thus when I put it in exclude mode and perform the necessary click dance on the physical device, the Z-Stick will blink to tell me it excluded. If my Z-Stick was dead, needing a charge, I'd just use one of my other hubs to be the hub to put into exclude and watch it say "unknown device excluded".


Adding to @Carl, there is no need to delete anything.

Your’s is a Zigbee device.

Simply reset and rediscover the device. HE will recognize it and rules and apps will continue to work as originally intended,

Flashing Red and disappearing from Hubitat is often a low battery for a Hue motion sensor.

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Thank you all for your quick response, it wotked well!

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I have had this happen a couple of times. Usually, I will remove the battery (or unplug it), then power it up again without doing a device reset. Then try to do a device search. If you are lucky, the device will be detected and added back to the system without having to mess with any of the rules, etc.

Download the Hubitat app