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G4CVZ - "Very low battery" warning

logidelic
Community Member

Hello!

I have the cheapo G4CVZ. Installed a few months ago and no problems until today when I saw the dreaded "Very low battery" warning.

Questions:

  • Am I right in understanding that this model uses alkaline batteries? The white battery sleeve with no markings makes me doubt...

  • Assuming the C-wire was working correctly, I would guess that the battery should have lasted much longer?

  • I see (below) that I still have a good VIN even when the system is heating. Am I right in understanding that this means that the C-wire is functioning correctly?

Details (right now while system is on/heating):

  • Connected to wires: C-W-R (heat only system)

  • VIN: 32.3V

  • LIN: 385

  • PS: C-385

  • Battery Voltage: 3.127V

  • Battery Impedance: 2372 mOhm

Thank you!

6 REPLIES 6

Markjosephp
Community Specialist
Community Specialist

Hello logidelic,

I'm sorry for the trouble this may have caused you — let's see what's going on.

The C wire conserves battery life because the thermostat only uses the batteries when the thermostat experiences power loss. Under normal operating conditions, the battery life is expected to last for about 2 years. However, depending on the Wi-Fi activity on the thermostat, the battery life might last longer or shorter.

I'd suggest replacing it with the recommended batteries: AAA 1.5 V alkaline batteries, such as Energizer AAA 1.5 V Alkaline Battery.

Please let me know if that helps.

Best regards,

Mark

Hey there,


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 trouble from here, as I would be happy to take a closer look and assist you further.

Best,

Mark

Thank you very much for the response. I replaced the batteries, but it is still mysterious as to why they died after only a month or two... For now I will wait to see how long the new ones last before investigating further...

Thank you again!

Markjosephp
Community Specialist
Community Specialist

Hello logidelic,

I appreciate your effort in replacing your thermostat's batteries. At the moment, let's monitor its behavior, and please keep us posted on how it goes.

Best,

Mark

EdwardT
Community Specialist
Community Specialist

Hi logidelic,

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 trouble from here, as I would be happy to take a closer look and assist you further.

Thanks,

Edward

EdwardT
Community Specialist
Community Specialist

Hi logidelic,

 

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

 

Thanks,

Edward