topic H72 error code in Nest Thermostats

H72 error code

Bpandy — Sat, 06 Nov 2021 21:09:54 GMT

H72 error code, heating not working and new born baby in the house.

Cannot find who to contact and google nest have no contact details

Re: H72 error code

Ashepherdson — Sun, 07 Nov 2021 00:41:57 GMT

That means the power from the furnace isnt reaching the nest, here is a list of steps to take before calling a pro in,

An H72 error message says 'The power to this thermostat is off'. Note that this error can take a few minutes to appear after power has been cut, so you may not see it immediately.

1. Check the thermostat power cable, plug and power socket.

If you have a Google Nest Learning Thermostat on the Nest Stand:

Make sure that the Nest power cable is fully inserted into the
power plug and that the plug has been pushed all the way into the
wall socket.
Check that the wall socket is switched on.

Note: We recommend plugging your thermostat into a socket that isn’t controlled by a wall switch to prevent accidentally switching it off.
You can also double check that the socket is delivering power by plugging in a lamp or other electronic device and turning it on.

2. Make sure that the display and power cable are fully seated.

Pull the display straight off.
Check that the power cable is fully inserted into the
power port and is routed correctly through the groove in
the base of the thermostat.
Line up the display connectors and press the display
firmly back onto the base. You will hear a click and the
display will lie flush with the base when it’s properly seated.

3. Check the fuse box

Check the fuse: It’s possible that the fuse controlling power to your system isn’t properly seated or is blown. Re-seat or replace it as necessary.
Make sure that the switch is set to 'on': Sometimes fuse switches can be tricky: you may think that you've flipped a switch back on, but it might not have been pushed all the way.
- Try flipping the switches that control power to Heat Link and your thermostat off and then on again.
- You can also check power on the socket that the Nest thermostat is using by plugging in a lamp or other electronic device and turning it on.

4. Contact a Nest Pro

If you’re still not able to fix the problem, contact a local Nest Pro, who can properly diagnose your heating system and your Nest thermostat.

Re: H72 error code

Bpandy — Sun, 07 Nov 2021 08:08:50 GMT

Hello the thermostat is installed to the wall so I cannot see where the cables go to but have no other power issues in the house.

I've tried to contact a pro and they've said to call the Google number but when I call it, it says they are closed.

I feel like I'm going around in circles and just need someone to take a look and fix this as we have a newborn baby and no heating

Re: H72 error code

CristianC — Wed, 10 Nov 2021 12:39:32 GMT

Hey @Bpandy,

Thanks for reaching out. I'll do my best to get this resolved for you. Can you check if you have any LED's on your Heat Link?
Here's the Google Nest support contact number: 0808 169 2307

Re: H72 error code

CristianC — Fri, 12 Nov 2021 12:42:59 GMT

Hello again. Just checking in. Do you still need my help?

Re: H72 error code

CristianC — Wed, 01 Dec 2021 17:48:05 GMT

It's been a while since this thread was last updated so I'll go ahead and lock this thread. If you're still experiencing problems, please feel free to start a new thread and we'll be happy to help.