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Nest learning thermostat

Kassidy13
Community Member

Nest learning thermostat randomly giving E73 errors and then clearing on its own. I see lots of other people with the same issue. Google representative was useless. Everything they suggested are things ive already tried which any person with a brain would have thought of. My ecobee never had this issue.

7 REPLIES 7

RnAElec
Community Member

if wired:
is there a constant 12v connection at the connections at the thermostat....

check all connections on the heatlink (T1/T2) and also at the thermostat end too!!, may be a loose connection somewhere or damage to the cable too.

 

 

 

Kassidy13
Community Member

Thanks. It is wiring and I did check the wiring that I knew what I was looking at. I'm not sure about the other stuff, I have someone coming to look at it tomorrow. 

Markjosephp
Community Specialist
Community Specialist

Hello folks,

 

I wanted to stop by and see how I could help.

 

Thanks for assisting, @RnAElec.

 

@Kassidy13, I'm sorry if you have to go through this. We'd like you to have a better experience. Let's sort this out.

Your thermostat detects the wire in the Rc terminal mechanically but not electrically. Either your system may not provide enough power or any power to either the thermostat or the specific wire, so your thermostat can't complete a circuit.

To isolate:

 

  • Could you please share with us your thermostat's wiring?
  • Check that the power to your HVAC system is turned on at the breakers.
  • Gather the power readouts from your thermostat's "Technical Info".
  • Ensure that all wires are properly stripped and seated in the terminals.
  • If you have a C wire, remove it and leave it disconnected.
  • A clog in the air filter can limit how much air flows over the cooling coils. If the clog persists, the cooling coils can freeze, which could cause a power issue.

 

Please let us know how it goes.

 

Regards,

Mark

Hi Mark

I had an HVAC specialist look at my furnace and my thermostat. We swapped wires and unplugged the C wire but I am still experiencing the same issue. The specialist thinks it's a problem with the actual thermostat and said hes constantly removing the particular model i have from people's homes. 

Markjosephp
Community Specialist
Community Specialist

Hi there,,

 

Oh no! Thanks for letting us know what you've done to have your concern isolated with the help of an HVAC technician. We'd like to take a further look into this for you.

 

Please fill out this form with the needed information and let us know once you're done.

 

Regards,

Mark

I have filled it out thanks.

Markjosephp
Community Specialist
Community Specialist

Hello Kassidy13,


Thanks for completing the form; we have received it. Soon, a member of our upper team will contact you via email. Please keep checking your email for updates, as this thread will be closed in 24 hours.


Best,
Mark