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Epic Genius
Posts: 214
Registered: ‎03-06-2017
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Warning: The C-wire is needed for Honeywell Lyric Smart Thermometer

After routing the two/three wire to a hole beside the old thermostat, drilling holes to mount the lyric because the lyric is too heavy to just dangle from the wires, inserting two wires at first the red and white and finally mounting the whole thing....  to find that the lyric doesn't power on. So I thought I better download the app, perhaps the app will turn it on. Nope.

 

So the 3rd last wire is blue but was left out of the original thermostat connection, so I exposed the wire to connect to the lyric thinking it might be the needed C-wire, remounted everything and ...... nope no power...

 

Apparently at my apartment, the blue wire doesn't have the needed 24 volt power. 

 

I could mount an external transformer to supply the needed 24 volts, but no, too much work. I need a smart thermostat that operates from battery :-P

 

Another lesson learn. 

Legendary Hero of the Universe
Posts: 1,636
Registered: ‎03-28-2015

Re: Warning: The C-wire is needed for Honeywell Lyric Smart Thermometer

We had a similar issue like that at my work where it didnt have the correct power for the Honeywell

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