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My Nest 3rd generation Thermostat has a red blinking light and not working

Servantt
Community Member

‎11-27-2023 10:03 AM

I've been working on this issue for a week now.  It's very cold, we are using space heaters until the situation is rectified.  It started off by saying no wi-fi connectivity.  Then I got red blinking lights. Took off the thermostat and connected to USB cable for 24 hours.  Still getting the red lights and no screen.  Please help.  We've had the nest now for about two years

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3 REPLIES 3

lexmunoz
Community Member

‎11-27-2023 10:08 AM

I am having same problem, please help

 

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Mates
Community Member

‎11-27-2023 05:08 PM

The red blinking LED sure says that the (rechargeable) battery voltage is too low. In case of the charging off-line (USB) it would resolve the problem (perhaps temporarily) only if the battery cell is able to hold the charge.
I suspect the heater system (and Nest) was powered down during the summer and the battery degraded if the thermostat was old(er).

 Do you have separate power (C) wire wired-up to supply the thermostat? That might alleviate the problem if the battery is weak.
When the red led indicates low voltage state the Nest won't connect to the network and will not function.
Sorry about that!
Please share details about your system wiring.

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zoeuvre
Community Specialist
Community Specialist
In response to Mates

‎12-03-2023 08:29 AM

Hi folks,

 

Thanks for your help, @Mates. 

 

@Servantt and @lexmunoz, yikes! I'm sorry to hear that your thermostat doesn't turn on though you've charged it already. Let's see what's going on. A few questions: 

 

  1. Are the power breakers on, and do you receive power to your home?
  2. Is the thermostat's display seated properly?
  3. Are all the wires of your thermostat seated firmly in its terminals (with no loose or exposed wires)?
  4. Did you charge the thermostat display using a micro-USB cable?
  5. Did you ensure that the cable you've used is working on another device?
  6. Did you ensure that the power outlet where you plugged in the thermostat to charge is working?
  7. Was there a recent power outage?
  8. How's the condition of the connector pins at the back of your thermostat display?


I'll look forward to your responses. 

 

Best,

Zoe

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