Nest thermostate won't heat at night

[Erick01]

Hi,

I have used my thermostat for more than3 years, it always works well. But 3 days ago, it cannot heat up at nighttime. It still shows very normal, showing heating, no error code on the display, but the air blowing out is not warm, I set it as 62F, it's 57F when I woke up in the morning. Daytime works as usual. It keeps doing this for 3days already. Both heat pump and alt heat are electric, with no gas. I chatted with agent, after following their suggestion, still didn't work at night. I reset everything, turned off learning, away assistant, safety temperature, eco mode, delete all schedules, but nothing worked, still cannot heat at night. I switched to my old non-wifi thermostats, it works day and night. it's newest version 6.2-22. Please help. This makes me very sad, even want to buy an other brand one, but the nest cost me almost $200. 

Please help.

[bgbienfait]

SAME.  Really irritated that I've had to turn off ALL the features we bought these things for to see if that would fix the problem and I still wake up to a COLD HOUSE!

[bgbienfait]

I just noticed in my app the activity sensor was on for both units - clearly when we're sleeping there is NO activity going on so it's just been turning itself off!!  How annoying!!  Turning this feature off and seeing if this helps tonight.  How frustrating to have spent the extra money for all these features only to have to turn them OFF!!

[Erick01]

I always keep sensor off, but still cannot heat

[Ryan_G]

Hi everyone, 

Thanks for all your posts here and we're sorry to hear about what's happening.

Let's check it further by trying the following:

• Check all the wire at the Nest Thermostat terminal. Make sure they are properly inserted. It would also help if you can re-strip them before inserting.
• Check the fuse and switch on your HVAC. 
• Clean the HVAC filters and drip pans.
• Go to settings > equipment then select the right heat type and source. 

Let me know how it goes by replying to this thread.

Regards,

Ryan

[Viktor_k83]

> Let's check it further

there is nothing to check here. It works in the daytime and shuts down in the nights. The topic starter even mentioned that he put a new thermostat and it worked as expected. Why are all these silly recommendations when hundred of people only in this google community get really freezing?