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Nest Won't Turn On
The Nest won't respond or show anything on the LCD
Nest is Turning On, Restarting, or Updating
A blinking green light will appear if the Nest is turning on, restarting, or updating. If the lights continue to blink for more than 5 minutes, remove and reconnect the display. If the light is still blinking after reconnecting the device, restart it by holding down the thermostat ring for 10 seconds.
Battery is Too Low to Start
A blinking red light will appear if the Nest's battery is too low to start. This could be due to a wiring problem or extended power outage. The Nest should charge itself within a few hours but you can speed up this process by using a micro-USB cable. To do this: remove the Nest display, connect one end of the micro-USB cable into the Nest and the other end into a powered-on computer or USB wall charger.
Common C Wire is Attached
A blinking green light could mean a common C wire is attached. The common C wire is not needed in most homes for the Nest to work properly. To remove the common C wire:
- Turn off the power to your HVAC system or home
- Remove the Nest's display
- Push and hold the gray spring-loaded tab next to the letter "C"
- Pull the C wire out of the connector
- Insulate the copper tip with a cap or electrical tape and push the wire back into the wall
- Reattach the display and turn the power back on
Wires Not Properly Attached
A blinking green light could mean the wires are not properly attached. To make sure the wires are properly attached:
- Turn off the power to your HVAC system or home
- Remove the Nest's display
- Push and hold the gray spring-loaded tab of the connector's wire you wish to remove and pull the wire
- Ensure the wire is straight and has 1/3" to 1/2" of copper exposed
- Seat the wires fully into the connector by holding down the gray spring-loaded tab and pushing the wire into the connector as far as it will go
- Reattach the display and turn the power back on
Faulty Battery
If the Nest's display is fully seated to the base, the light at the top is off, and the LCD isn't showing anything, a faulty battery may be the cause. For step-by-step instructions on how to replace the battery, follow this guide.
Broken/Faulty LCD
If the Nest's display is fully seated to the base, the light at the top is off, and the LCD isn't showing anything, a faulty or broken LCD may be the cause. For step-by-step instructions on how to replace the LCD, follow this guide.
Auto-Away Function Isn't Working
The Nest's auto-away function isn't automatically adjusting its settings when you leave or come home
Faulty Auto-Away Sensor
If after learning your schedule, Nest is no longer going into auto-away mode, a faulty auto-away board may be the cause. For step-by-step instructions on how to replace the auto-away sensor, follow this guide.
Can't Manually Adjust Settings
Nothing happens when metal ring around the display is rotated
Faulty Optical Finger Motion Sensor
To change settings on the Nest Thermostat, a metal ring around the display is rotated. If rotating the outer ring no longer adjusts the settings, a faulty optical sensor may be the cause. For step-by-step instructions on how to replace the optical motion finger sensor, follow this guide.
Nest Can't Find Wi-Fi Network
Wait for a period of 30 to 60 seconds for the thermostat to scan for other networks.
Try resetting your router.
Check if your network is hidden. If so, select TYPE NAME (then type your network’s SSID and password). Next, choose your security type, after which you will be prompted.
Try another Wi-Fi device to verify your network is visible.
Is the router set up to support the Nest? Check if router is set up to support the Nest (make sure you are NOT using 5GHz mode).
Restart your Nest.
Check for Wireless interference (turn off devices that could cause interference, such as cordless phones, baby monitors, and microwaves).
Nest Can't Connect to Wi-Fi Network
Enter password again.
Try connecting using another Wi-Fi device.
Restart your Nest.
Reduce the number of wireless devices connect to network.
Reset your Wi-Fi router.
Temporarily turn off wireless security on router.
Turn off MAC address filtering on your Wi-Fi router.
Update firmware on your router.
Nest is OFFLINE On the Nest App and Web
Some of your Nest Products are Offline
Check your Nest battery in Nest, it may be low.
Check your Wi-Fi signal strength, it may be too weak. If so, you should consider the possibility of relocating either the Nest Thermostat or your router in order to improve signal strength.
All Nest Products Are Offline
Your network may be down due to a power outage. If so, wait for power to resume.
Check with your Internet service provider to see there are any network outages. If so, wait for ISP connection to resume.
Restart your Wi-Fi router (unplug and wait a few seconds, then plug them back in).
Have you changed your Wi-Fi name or password recently? If so, update the Wi-Fi settings on your Nest Thermostat.
AC is Not Operating Correctly on Nest Settings
AC is Constantly Cycling
Try resetting the thermostat. If that doesn't resolve the issue, it is possible that the AC is constantly cycling because the base motherboard is bad and must be replaced. For step-by-step instructions on how to replace the base motherboard, follow this guide.
AC is Running Too Hot or Too Cold
Try resetting the thermostat. If that doesn't resolve the issue, it is possible that the AC is running too hot or too cold because the base motherboard is bad and must be replaced. For step-by-step instructions on how to replace the base motherboard, follow this guide.
AC is Constantly On
Try resetting the thermostat. If that doesn't resolve the issue, it is possible that the AC is constantly on because the base motherboard is bad and must be replaced. For step-by-step instructions on how to replace the base motherboard, follow this guide.
댓글 5개
Why won't display work on nest when you change temperature from phone ?
Andy Rutherford - 답글
My nest Thermostat E will not detect and light up when walking my it or any other motion. Looking for advise for fix.
Helga Huelskoetter -
Nest blinking red light and then green light but screen won’t turn on
Chandni Choithani - 답글
I bought two of these slightly used from someone on eBay and I received $100 off of the usual base price of $250 per unitbrcause he said these weren’t compatible with heat pumps but I know that’s not true so I took that risk and bought them. After physically installing them and turning up the power it took me some time to finally figure out one of the backplanes had an issue. So I called nest and waited literally almost 2 hours and then almost hung up on him trying to turn off my mute. I didn’t tell him I bought these used and I tracked it down to one of the plates autostarting my AC before I even lugged the face in. He asked me to swap plates and the issue followed and he was convinced and overnighted me a new plate. I’m just sold my home and I didn’t pull those down I time and the buyer asked for these to be included. Since I bought these I have become self efficient in fixing electronics for myself and so I popped that faulty back open and almost instantly spotted a blown F4 fuse that should fix everything
jon vanderzee - 답글
'``I’m still learning on the hardware side so I was wondering if anyone know what size and rating those fuses are on the backplane PCB. I’m doing this just for the !&&* of it as it could be used as a backup or maybe I could help someone else that could really use a break since theirs fried. I think the guy I bought these from gave up on his install and fed me the excuse that they weren’t compatible when the truth is he was playing around with his wiring and probably crossed one of his 24v wires to the wrong terminal on the board and smoked that J4 fuse. I guess I got lucky that nest didn’t did any deeper in my troubles or they felt bad for waiting on the phone so long. This was before google but it felt like they really didn’t want to help you as they chanted every 3 min that more than likely they could fix my problems online instead on the phone. It paid off for persistence and they did make it right even though they didn’t know all of the details…..whew!! Please Let me know your guess on fuse size/type
jon vanderzee - 답글