Nest A/C red power wire down

[Tm38]

Power shuts off no voltage to nest. Then it turns on for short time - off again. 

[Patrick_Caezza]

@Tm38 

Check the drain at the furnace/air handler and see if it is blocked. A safety switch there will shut your system down if the water backs up.

Also, ensure the filter door and all covers are correctly closed, as there is also a safety switch on them.

Which Nest thermostat do you have?

How is the thermostat wired? Is there a C wire installed?

[Tm38]

The Voc & the Vin are both at .11. The battery voltage is 3.57

Ya think the furnace is not charging the Nest? 

[Tm38]

Also it kicks on for 3 minutes every now and then   And the red power is clear again. 
once it kicked on just now I turned it way down to 65. We’ll see. I also. Hanged the filter like you said.  Ill

get back to you. Thank you. Very much. I appreciate your input and assistance 

[Tm38]

just kicked off again. Seems to cool off just enough might get to 77ish. Does it have a hard line temp max/min?

[Patrick_Caezza]

@Tm38 

Ya, the 3.57 battery voltage tells me you have a power problem.

If no C wire is installed, you must install one to solve the problem. Check to see if you have a spare wire in the thermostat cable. If you do, you can use it to create a C wire by connecting it to the C terminal on both ends. If there isn't a spare wire, you will then need to install a Google Nest Power Connector.

[Tm38]

no c wire.  But the A/C worked for the past 3 months no issues!  The  red electronic indicator goes off and turns red. Then 20 minutes later turns and and goes clear.  For a few minutes.  Thx for checking in.  

[Patrick_Caezza]

@Tm38 

Yup, the thermostats tend to work just fine for a time, and they start showing issues when there is no C wire installed.

[Tm38]

Right on the money.  After it gets 20 minutes of low voltage it works for 3 minutes.  Fans are on!  We’ll survive.  Landlord was notified, crickets!  

[Jrey5]

I had the same issue. Plugged the red wire in more and the message went away. Now it’s blowing heat on the cool setting. 

[Jeran]

Thank you for helping out on this thread, Patrick_Caezza!

Hey there Tm38,

I'm just checking up on this thread, do you have any more questions or need any additional help? 

Best regards,
Jeran

[zoeuvre]

Hi Tm38,
 

I wanted to check and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have. 
 

Thanks for your help, @Patrick_Caezza and Jeran. 

Best,

Zoe

[Jenelyn_O]

Hello there,

We haven't heard from you in a while so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.

I appreciate your help, @Patrick_Caezza, Jeran, and Zoe.

Thanks,

Jenelyn