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Nest thermostat cannot charge anymore after a thoundstorm

Community Member

I posted this three weeks ago.  The specialist didn't even read my post carefully before answering my question.  Those Nest thermostat worked fine without a C wire.  I have used this way for more than 6 years and I still have two working without any issue.   Please use some logic before giving an answer. 


My Nest thermostat can only be charged via USB after a thunderstorm with power outage.  This is the second one died in this way.  My heating system doesn't have a C wire.  I know the wiring works because I have 4 Nest thermostats, one for each heating zone.  All the other work except this one which is connected to both AC and Heating. The rests are heating only.   Every time, when this problem happened, I replaced the display unit, then it works. 

Now I ended up with two dead Nest 3rd gen displays.  But they work fine if I charge them with USB port, they just don't charge on the base anymore. 

My question is whether the hardware was damaged on those displays?  Can I still save them by using an external C wire adapter?


Community Specialist
Community Specialist

Hello PangPang1,

I'm sorry to hear you're having issues with your Nest Thermostat displays not holding their charge. I'd be happy to take a look at this for you.

Using two thermostat displays is an indication that there was a problem with the power. Installing a C-wire or a Nest Power Connector would help deliver constant power to the thermostat. Please check out these articles for more details and let me know if you have more questions.




Community Specialist
Community Specialist

Hi PangPang1,

I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.