topic Re: Power Connector not detected in Nest Thermostats

Power Connector not detected

plk — Fri, 16 Dec 2022 15:35:44 GMT

I installed two Nest thermostats onto separate zones of a two wire heating system and installed power connectors for each zone. One thermostat set up perfectly - no issues. The second thermostat refuses to detect the power connector and reports an N260 error. I've checked all the wire connections; they are identical for the two zones/connectors, so whatever was done works for one zone but not the other. Nevertheless both thermostats are seemingly controlling their respective zones despite the N260.

I've replaced the power connector for the mis-behaving thermostat, but the thermostat still reports an N260 error.

I've swapped the thermostats and the one from the good zone reports N260 when mounted on the bad zone while the thermostat from the bad zone does not report an error when mounted on the good zone.

The thermostat on the bad zone also drains the batteries faster than the one on the good zone, which is consistent with the undetected (or un-accessed) power connector and this is the real problem because I need to monitor this heading system remotely and am concerned that the batteries will die and the zone will be stuck in the off position during a cold snap.

Since neither thermostats nor the power connectors appear to be defective, I'm at a loss to figure out what the problem might be or how to fix it.

Re: Power Connector not detected

MplsCustomer — Fri, 16 Dec 2022 16:14:09 GMT

@plk

This is an ignorant guess, since we don't have Nest thermostats, but since both thermostats report report an N260 error only in the "bad" zone, it almost seems that the wiring or power for your heating system in the "bad" zone must be different from that in the "good" zone.

Re: Power Connector not detected

plk — Fri, 16 Dec 2022 16:42:50 GMT

I agree, but the real question is how can I determine what that difference is and how can I fix or get around it.

Re: Power Connector not detected

EdwardT — Fri, 23 Dec 2022 00:31:46 GMT

Hi folks,

@MplsCustomer, thanks for the help!

@plk, thanks for reaching out. I'm sorry to hear that you're having an issue with your Nest Thermostat. I'd love to know more about this. Could you check the power readings of your 2 thermostats?

Thanks,

Edward

Re: Power Connector not detected

plk — Fri, 23 Dec 2022 10:22:42 GMT

Problem solved...Zone was incorrectly wired before installing p.c. Not sure how the old the old (non-Nest) thermostat worked

Re: Power Connector not detected

EmersonB — Fri, 23 Dec 2022 13:49:00 GMT

Hi everyone,

@plk thanks for getting back to us and we're glad that it's resolved now. We can consider this one complete so let us know if you have other questions or concerns as I will be locking this after 24 hours. Feel free to start a new thread and we'll be happy to help.

I appreciate the help, Edward and MplsCustomer.

Regards,
Emerson