topic Re: Not cooling using heat pump in Nest Thermostats

Not cooling using heat pump

VIGALENTDEMON — Mon, 07 Nov 2022 06:03:25 GMT

So here's the short. Bought a house last year, heat worked perfect for the winter and ac worked perfect for the summer. Now that it's fall again the heat didn't want to work at first but cooling did. Now it's flipped and heat works but no cold air just the fan running. I've tried troubleshooting switching the o/b settings, reset system, reset nest and nothing seems to help. I have the previous wiring from old unit and have double checked current wiring for nest. I don't know how to cool my house at this point.

Re: Not cooling using heat pump

Houptee — Mon, 07 Nov 2022 14:59:01 GMT

Sounds like the system has a problem not the Nest.

There is a reversing valve in the outside unit that changes the flow of the refrigerant aka Freon when you change between heat and ac. Possibly the valve is not functioning properly. Might need to get a hvac technician out to check what is going on.

Re: Not cooling using heat pump

VIGALENTDEMON — Mon, 07 Nov 2022 15:29:01 GMT

That's what I was leaning more towards as well, that or a refrigerant leak somewhere in the lines or a clog. Haven't noticed any freezing though so most likely the reversing valve. Wish me luck.

Re: Not cooling using heat pump

Anonymous — Mon, 07 Nov 2022 19:11:54 GMT

Try to change the heat pump orientation to check if cooling mode is working, kindly follow the steps with this link:
https://support.google.com/googlenest/answer/9257086?hl=en

Re: Not cooling using heat pump

Houptee — Mon, 07 Nov 2022 21:17:41 GMT

You can test the valve by first disconnect the power to the outdoor unit at the disconnect box. Then removing the wires from Nest and jumper the Red (power) to OB to force the reversing valve to change position. Have someone apply the jumper as you go outside and listen if the valve is making a sound when it energizes. Sometimes just the coil on the valve goes bad and you can replace that. If the internal part is bad you need to recover the refrigerant and cut it out and braze a new one in, then recharge the system.

Re: Not cooling using heat pump

VIGALENTDEMON — Tue, 08 Nov 2022 00:37:53 GMT

I will give this a shot tonight when I get home and let you know how it goes just in case I have an HVAC tech coming out Wednesday.

Update it did not charge/make a sound. HVAC tech here we come luckily it's got the manufacturer warranty.

Re: Not cooling using heat pump

VIGALENTDEMON — Mon, 07 Nov 2022 21:40:30 GMT

As stated above have tried to change settings for o/b through nest but I do appreciate the insight.

Re: Not cooling using heat pump

VIGALENTDEMON — Wed, 09 Nov 2022 17:23:05 GMT

Ended up being a burnt wire to the condenser. 5 minute fix, my normal heat wasn't working either it was only aux heat and emergency but all is good now.

Re: Not cooling using heat pump

Markjosephp — Sat, 12 Nov 2022 20:51:34 GMT

Hi folks,

Thanks for the help, @Houptee and @Anonymous.

@VIGALENTDEMON, I appreciate the update and for keeping us in the loop on what you've done to have your concern rectified.

I wanted to ensure that everything was covered here. Please let us know if you have any other questions or concerns.

Best regards,

Mark

Re: Not cooling using heat pump

Markjosephp — Tue, 15 Nov 2022 21:08:12 GMT

Hello VIGALENTDEMON,

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 regards,

Mark

Re: Not cooling using heat pump

EmersonB — Wed, 16 Nov 2022 22:02:54 GMT

Hi VIGALENTDEMON,

Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.

I appreciate the help, Mark and Houptee.

Thanks,
Emerson

Re: Not cooling using heat pump

VIGALENTDEMON — Wed, 16 Nov 2022 23:30:46 GMT

Everything is fixed now it was the common blue wire going to the condenser but not the common blue wire to the thermostat that was the issue. 5 minute fix

Re: Not cooling using heat pump

EdwardT — Thu, 17 Nov 2022 00:24:19 GMT

Hi VIGALENTDEMON,

Thanks for the update! I'm glad to hear that it's working fine now. I will be locking this thread in 24 hours. Please feel free to create a new thread should you have some more questions or concerns in the near future and we'll be more than glad to help.

Thanks,

Edward