Not cooling using heat pump

[VIGALENTDEMON]

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.

 

[Houptee]

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. 

[VIGALENTDEMON]

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.

[Houptee]

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.

[VIGALENTDEMON]

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.

[VIGALENTDEMON]

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.

[Markjosephp]

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

[Markjosephp]

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

[VIGALENTDEMON]

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

[EdwardT]

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

[EmersonB]

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

[Anonymous]

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

[VIGALENTDEMON]

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