# Zwave no\_ack

**URL:** <https://community.homey.app/t/zwave-no-ack/117561>\
**Category:** Questions & Help\
**Created:** [October 7, 2024, 11:11am UTC](https://community.homey.app/t/zwave-no-ack/117561 "2024-10-07T11:11:09Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Bert](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/bert/32/2352_2.png) [@Bert](https://community.homey.app/u/Bert)\
**Post date:** [October 7, 2024, 11:11am UTC](https://community.homey.app/t/zwave-no-ack/117561/1 "2024-10-07T11:11:09Z")

</div>

Hi All,

Out of the blue all my Zwave devices stopped responding.  
They do still work if a flow turns a light on or off, but they do not respond to my input via the Homey app.  
In the app I get a ‘TRANSMIT\_COMPLETE\_NO\_ACK’ error message.  
See attached screenshots:

 ![IMG_0567](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/6/a/6a6dbfcf5db7d96f83c30fb3418cc4d9f5455525.jpeg)

 ![Scherm­afbeelding 2024-10-07 om 12.12.31](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/b/a/ba9484ada8c31b8dcd19ddeefdaf0441376cddf8.png)

Bit of logging from the developer tool:

```auto
2024-10-07T08:59:57.753Z
Command[95] end: sendData
2024-10-07T09:17:32.294Z
Node[24]: [COMMAND_CLASS_SENSOR_MULTILEVEL] {"Sensor Type (Raw)":{"type":"Buffer","data":[1]},"Sensor Type":"Temperature (version 1)","Level (Raw)":{"type":"Buffer","data":[34]},"Level":{"Size":2,"Scale":0,"Precision":1},"Sensor Value (Raw)":{"type":"Buffer","data":[0,217]},"Sensor Value":{"type":"Buffer","data":[0,217]}}
2024-10-07T10:13:23.124Z
Command[96] start: heal
2024-10-07T10:13:23.162Z
Command[96] status: heal, status: REQUEST_NEIGHBOR_UPDATE_STARTED
2024-10-07T10:13:28.386Z
Command[97] start: sendData
2024-10-07T10:13:35.238Z
[ProcessSendData]: To node: 14 with data: 0x2002 and txOptions: TRANSMIT_OPTION_ACK,TRANSMIT_OPTION_AUTO_ROUTE,TRANSMIT_OPTION_EXPLORE
2024-10-07T10:13:35.240Z
Command[96] end: heal
2024-10-07T10:13:41.554Z
[ProcessSendData]: Marked node 14 as noAckNode
2024-10-07T10:13:41.556Z
Command[97] end: sendData
2024-10-07T10:13:41.760Z
Command[98] start: isFailedNode
2024-10-07T10:13:41.766Z
Command[98] end: isFailedNode
2024-10-07T10:13:47.838Z
Command[99] start: sendData
2024-10-07T10:13:47.840Z
[ProcessSendData]: To node: 14 with data: 0x250100 and txOptions: TRANSMIT_OPTION_ACK,TRANSMIT_OPTION_AUTO_ROUTE,TRANSMIT_OPTION_EXPLORE
2024-10-07T10:13:54.110Z
[ProcessSendData]: Marked node 14 as noAckNode
2024-10-07T10:13:54.111Z
Command[99] end: sendData

```

Any suggestions what could have caused this to happen, and how I can fix this??

---

<div class="post-metadata">

**Author:** ![Emiliano\_Quetimporta](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/emiliano_quetimporta/32/73402_2.png) [@Emiliano\_Quetimporta](https://community.homey.app/u/Emiliano_Quetimporta)\
**Post date:** [October 20, 2024, 8:08pm UTC](https://community.homey.app/t/zwave-no-ack/117561/2 "2024-10-20T20:08:41Z")

</div>

Same issue today, unknown route for a powered zwave device. Impossible to use from the app getting transmit\_complete\_no\_ack and not able to heal.

As the option is not available like for Zigbee devices to repair. Anybody an idea of how to fix this? If I add the device manually again without removing it first, will it be replaced and all flows keep working out will it be recognized as a new device and have to fix all the flows?

---

<div class="post-metadata">

**Author:** ![DirkG](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/dirkg/32/118897_2.png) [@DirkG](https://community.homey.app/u/DirkG)\
**Post date:** [October 21, 2024, 5:57am UTC](https://community.homey.app/t/zwave-no-ack/117561/3 "2024-10-21T05:57:40Z")

</div>

> [@Emiliano\_Quetimporta](#):
>
> If I add the device manually again without removing it first, will it be replaced and all flows keep working out will it be recognized as a new device and have to fix all the flows?

During the pairing process of Z-Wave devices, they are automatically removed from the Z-Wave controller in the first step (first green check mark) and then added as a new device in the second step (second green check mark). Therefore you have to repair all flows afterwards.

Even though there is a script by @martijnpoppen that makes it much easier to repair advanced flows ([link](https://community.homey.app/t/how-to-pro-cloud-tool-to-fix-advanced-flows-after-removing-and-re-adding-devices/65018)), I would like to ask you to contact Athom support first because of this issue.

---

<div class="post-metadata">

**Author:** ![Bert](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/bert/32/2352_2.png) [@Bert](https://community.homey.app/u/Bert)\
**Post date:** [October 21, 2024, 6:49am UTC](https://community.homey.app/t/zwave-no-ack/117561/4 "2024-10-21T06:49:10Z")

</div>

I’ve been in contact with support about this, still without any luck.  
Even after completely resetting the Z-Wave network and re-adding devices it is not working. Devices that are right next to Homey stoped working right after being added, giving me a unreachable error message.