I always thought it was a V2 hub - but after checking - it’s a Smartthings Wifi… 
I’m off to Google what that means and whether it’s compatible with my sensors
@RBoy - do you think the problem is because I’ve got a Smartthings Wifi ?
Unlikely. Zwave and WiFi are on different frequencies. If your other zwave devices are working then it probably a bad batch. If no zwave devices are working then it’s a bad hub / module.
Sorry… if this is a stupid suggestion (just because I had the same problem). Are you pressing the correct tiny button on the sensor to pair it? It’s a tiny hole that you need a paper clip for, not the larger button you can see when you take off the cover. There is no picture in the instruction manual for this.
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Good suggestion…but I’ve got the right button…
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Maybe another bad suggestion: take the battery out press and hold the button while you put the battery back in and keep holding it for a little longer. That often resets devices.
@pizzinini - worth a try - didn’t work though
received two replacement sensors - neither of the two new sensors will pair. Very sad.
I don’t have any other z-wave devices to test.
Added:
Argghhhh
Just found this:
But the Catch 22 with Australia is that Z-Wave uses a different frequency here rendering the unlicensed US 908.42Mhz and all US devices useless here. So, while there are thousands of devices using Z-Wave, they are country specific. That is why Samsung took a while to make its SmartThings hub for Australia/NZ.
From here: https://www.gadgetguy.com.au/samsung-smartthings-finally-in-australia-well-for-victorians-anyway/
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Ah, yup. We probably should have caught them when you posted your shard was AP02.
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Huh, I didn’t realize that Monoprice ships outside the US
@RBoy - yep, they do. At least twice. Once for the original two ($78 shipping) and then for the replacement two ($0).
Their support should have picked that up. Or at least a warning on their site.
While you’re here…do your apps and device handler support this:
http://zwave.com.au/index.php?_a=viewProd&productId=263
The primary need is to detect small temperature and humidity changes (1°C, RH 1%).
Many thanks.