topic Re: The fan mode turns on the A/C side of my heat pump in Nest Thermostats

The fan mode turns on the A/C side of my heat pump

Jdmerg — Mon, 09 May 2022 23:15:24 GMT

What I previously had for wiring

and what I have currently running

Re: The fan mode turns on the A/C side of my heat pump

Patrick_Caezza — Mon, 09 May 2022 23:37:59 GMT

Because you have the fan connected to the cooling and the cooling connected to the fan.

Try this wiring.

Green - G to G

Blue - B to OB

White - W/E to * (set for Emergency heat)

Brown - W2 to W2 (set as AUX heat)

Red - RH to Rc (jumper to RC not needed)

Yellow - Y1 to Y1

Orange - Y2 to Y2

Black - S1 - not used

You will also need to change the reversing valve setting.

On your thermostat, go to Settings.
Select Equipment.
Select Continue > Continue.
Select Heat Pump.
The Nest Thermostat defaults to an O setting for heat pumps.
- Select B.
To make sure the issue is resolved, test your heating and cooling again.

Re: The fan mode turns on the A/C side of my heat pump

Jdmerg — Tue, 10 May 2022 00:20:33 GMT

The pump will not turn to heat or cool in this config, but the fan turns on

Re: The fan mode turns on the A/C side of my heat pump

Jdmerg — Tue, 10 May 2022 00:55:44 GMT

the heat pump is set to B
The heat pump will not turn on to heat or cool
The alternate heat works
The fan works

Re: The fan mode turns on the A/C side of my heat pump

Patrick_Caezza — Tue, 10 May 2022 01:54:54 GMT

It sounds like there is something wrong with your system other than the Nest.

If you connect the Yellow, Green, and Red wires together the system should turn on and blow cool air. This will tell us if the problem is with your system or the Nest.

Did the orange wire connect to the S1 or Y2 terminal on the old thermostat? Looking at your original thermostat's wiring again and I think I might have it in the wrong place.

Re: The fan mode turns on the A/C side of my heat pump

Jdmerg — Tue, 10 May 2022 02:06:43 GMT

On the original thermostat the orange wire was connected to Y2.

There is a black wire that went to S1 and was not used in the nest.

I have reattached the old thermostat and everything cycles fine and works as it should.

Re: The fan mode turns on the A/C side of my heat pump

Patrick_Caezza — Tue, 10 May 2022 02:24:48 GMT

I'm at a loss at what the problem is except that the Nest might be bad.

Re: The fan mode turns on the A/C side of my heat pump

Jdmerg — Tue, 10 May 2022 02:27:48 GMT

Thanks for you help

Re: The fan mode turns on the A/C side of my heat pump

Ryan_G — Sat, 21 May 2022 23:18:29 GMT

Hi Jdmerg,

Thanks for reaching out here in the community.

I'd like to jump in here and check how your Nest thermostat is doing. Let us know by replying to this thread and we'll be glad to assist you if there's any other questions.

Thank you for your assistance, Patrick_Caezza.

Best regards,

Ryan

Re: The fan mode turns on the A/C side of my heat pump

Ryan_G — Wed, 25 May 2022 02:57:25 GMT

Hey Jdmerg,

I just wanted to follow up and see if you're still in need of help. Please let us know as we would be happy to answer any questions you may have.

Best regards,

Ryan

Re: The fan mode turns on the A/C side of my heat pump

MelbaDT — Thu, 02 Jun 2022 03:26:32 GMT

Hi,

We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.

Best,

Melba