cancel
Showing results for 
Search instead for 
Did you mean: 

Nest off line and Thermostat showing H72

Kbro1
Community Member

Hi,

My Nest thermostat suddenly went off and the scree is black. My app is showing it off line.

I have taken it off the wall and put it on charge overnight the reattached it to the wall mount and it is now lit up but showing H72 ‘the power to this thermostat is off.’ I’ve check my fuse board and all breakers are in.

can anyone help?

4 REPLIES 4

Houptee
Silver Product Expert
Silver Product Expert

You need to use a multimeter and test for 24v ac power on the red wire to C wire.

If no power possibly the transformer in the furnace went bad.


Houptee -- NJ Master HVAC Licensed Contractor

Jhonleanmel
Community Specialist
Community Specialist

Hey folks, 

We appreciate your help here, @Houptee.
@Kbro1, 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 concerns or questions from here, as I would be happy to take a closer look and assist you further.

Thanks,
Mel

Hi there,

 

Thanks for assisting, Mel.

 

@Kbro1, I'm checking back in — how's it going? Still need our help? Let us know so we can assist you right away.
 

Thanks,

Mark

Hi Kbro1,

 

I'm checking in to make sure that you've seen our response. If you have any further questions or concerns, please let us know before we lock this thread in 24 hours.

 

Regards,

Mark