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Need help figuring out the rewiring on this as nest isn't getting constant power for charge

jayceepho
Community Member

Problem: Can't seem to get a constant power running into nest learning thermostat to keep a charge. Here's the current set up (as simple as possible) 

 

THERMOSTAT > 4 wires > green (fan), red (power), white (heating), black (cooling, get to this in a sec)

HVAC > Y W R G C (nest power adapter already connected) > brown insulated wires from HVAC branching to...

1) Thermostat wiring connected to nest (beige insulated)

2) Compressor (dark thin brown insulated)

 

How can I go about the wire nuts to get power running to the thermostat wiring (beige insulated wire)?

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11 REPLIES 11

CoolingWizard
Platinum Product Expert
Platinum Product Expert

@jayceepho ,

Your Nest Power Adaptor is wired correctly. Your two cables are interconnected as follows:

IMG_1956.jpeg

If you are still not getting power at all, you need to check for a blown fuse at the HVAC control board.  

AC Cooling Wizard 

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner. If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.

Hey @CoolingWizard thanks for the reply! Fuse looks to be fine… I switched out and still the same issue of not getting charging power to thermostat.

CoolingWizard
Platinum Product Expert
Platinum Product Expert

@jayceepho , does your nest thermostat “see” or otherwise recognize the Power Adapter?

AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner. If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.

How can I confirm it does? Would it show some kind of notification because I don’t see anything related to that

CoolingWizard
Platinum Product Expert
Platinum Product Expert

@jayceepho , when you use a Nest Power Connector, the Nest Thermostat needs to recognize it is being used.  In my experience the Nest Leaning Thermostats are supposed to automatically recognized without a software update.  On your nest display go to SETTINGS > POWER CONNECTOR > POWER TEST.

AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner. If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.

Hey @CoolingWizard  so I’ve tried to re position the wires but still no luck. I see no option for power connector either on my nest learning 

CoolingWizard
Platinum Product Expert
Platinum Product Expert

@jayceepho ,

Try to update the software on your Nest Thermostat, I know that some of the older version do not recognize the Power Connector until after the software update.  

AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner. If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.

Already updated to latest version

EdmondB
Community Specialist
Community Specialist

Hey everyone,

@jayceepho, we'd like to know more about this. Please fill out this form so we could investigate further.

Thanks for the input, @CoolingWizard.

Best,
Edmond

Jenelyn_O
Community Specialist
Community Specialist

Hi jayceepho,

 

Chiming in — I just want to check if you were able to fill out the form. Please let us know once done.

 

I appreciate the help, @CoolingWizard and Edmond.

 

Thanks,

Jenelyn

CoolingWizard
Platinum Product Expert
Platinum Product Expert

@jayceepho ,

at this point I am a loss as well.  I know from experience the Nest Thermostat must communicate with the Nest power connector before it can initiate and use. Once that is complete, and new entry shows up under SETTINGS>POWER

AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner. If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.