HIVE wiring help! Please

I found this post really confusing.

According to the below, the thermostat was OK then "stopped working"...
Thanks, I was thinking exactly the same thing and was similarly perplexed, but now we know! :)

...although it still leaves me wondering why the original stat was installed, but not working :unsure:
 
Thanks, I was thinking exactly the same thing and was similarly perplexed, but now we know! :)

...although it still leaves me wondering why the original stat was installed, but not working :unsure:
You would be surprised by how common this is, too many installers are just pipe joiners and have no clue what happens inside that big white box, never mind how the control systems work
 
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