MH-Z19C Timeout?

[Beginner96]

Hello !
I have a small problem with my co2 sensor, the mh-z19c.
When I first connected it, it worked just fine.
But now i have the problem, that below the mh-z19 node the report "timeout" shows, with small red dot infront of it.

Has someone the same problem and could help? I don't know what to do.

Thanks and best regards.

[edje11]

You have to supply us some more info.
Post the relevant part of your flow here.

[Beginner96]

Thanks for your answer.
Like I said, at first everything worked fine, but suddenly, without any changes, this "timeout" report appeared. I researched it but couldn't find anything. I hope to find help here.

[zenofmud]

What is the full name (nodered-contrib-????) of the node you are using?

add a catch node connected to a debug node (set to show the complete msg object) to the tab you flow is on.

Also check the node-red log to see if there is anymore information.

[Beginner96]

The full name is : node-red-contrib-easybotics-air-quality.

I did connect a catch node like so :

But nothing happened, i got no reports at all and the debug tab on the right side remains empty.

I set the catch node to "all nodes" and also just for the mh-z node. both times no reports.

[zenofmud]

You said it use to work, what has changed? Did you do any upgrades?
Can you stop Node-RED and then in a terminal start it up and copy the log and paste it to a reply. I want to see if anything shows up in the log.

[Beginner96]

I didn't change anything, thats why I'm so clueless.
This is my first time using node red, how do i do that what you said?

[zenofmud]

What device are you running NR on?

How did you install NR?

If it is a pi, open a terminal and enter ‘node-red-stop’
Then
‘Node-red’

[Beginner96]

I get this report. I know that the bme has an remote error I accidently damaged a wire.

But i don't know why MH-Z19 switches to passive mode.

[zenofmud]

Can you answer all my questions and show the full startup log and do a copy paste of it to a reply. Thanks

[Beginner96]

I Use node red on a RaspberryPi 4B.
I installed it as discribed here:

https://nodered.org/docs/getting-started/raspberrypi

I also enabled autostart.

The full startup log is here.

I Hope this time I replied all of your questions.

[zenofmud]

What happens if you disable the bme280 nodes?

[Beginner96]

Everything stays the same.

[zenofmud]

did you start/stop nr and check that the bme error messages were gone?

You said that it was all working and then you accidently damaged a wire. Did this happen about the same time as the MH-Z19 node issue occurred?

Which node are you using to read the BME280? Is it using I2c and could there be an issue with I2c.

[Beginner96]

The BME has nothing to do with it, the mh-z went into timeout way before this thing with the wire's happened. I also disconnected the bme and rebooted everything but the mh-z is still in timeout or passive mode. I also disconnected the mh-z and changed wires but still n passive mode.
I use the node " node-red-contrib-bme280 : Bme280" for the bme.

[zenofmud]

Have you tried checking it outside node-red? Could the sensor be bad?

[Beginner96]

Yes i did that to. For CO2 measure it is one of the most reliable sensors.

[zenofmud]

I think you should open an issue on the nodes GitHub page.