nest thermostat 3rd generation makes my heat pump clicking

[alek_mal]

My nest thermostat 3rd generation makes my heat pump clicking. Let say it needs to cool the temperature down. It starts, cools down to the right temperature. Stops and then I hear clicks about every 10 - 30 seconds. The clicking is coming from my Heat Pump. If I disconnect the thermostat then the clicking is disappearing.

Any ideas? 

I've read as if it's missing wire C.

When I removed old thermostat (Honeywell), I did not have C wire. I had 4 wires as described below:

1. Y

2. G

3. R

4. OB

Thanks for any help.

[Jake]

Hey alek_mal,

Sorry for the late reply. I wanted to follow up and ensure you are good to go. 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,
Jake

[Jake]

Hey alek_mal,

I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity. 

Best regards,
Jake

[Jake]

Hey alek_mal,

It has been a few days since the last reply, and I am going to lock the thread at this time. If you have any questions, please feel free to create a new post. 

Best regards,
Jake