Hello @Pavanvijay
Thanks for your reply. I'm so glad to assist you with this wiring configuration. Let's take a look to find an answer.
I appreciate your picture and your reply. I can see you have S1 and S2. The Nest thermostat does not need these wires. Wires labeled S can be indicator lights or sensor wires. The Nest thermostat uses its LCD display instead of an indicator light and gets sensor information, like outdoor weather conditions, over Wi-Fi.
Now, with the rest of the wiring, there may be a slight variation if your system uses a Heat Pump or if it is a Conventional system. For this type of wiring, we tend to be guided a lot by the colors of the cables. According to what they tell me, their system uses a Heat Pump.
It should be noted here that since I do not know the information about your system, I have been guided by the above-mentioned. If you have a Conventional system, you can feel free to correct me, and I will share with you the necessary corrections in that case.
Taking into account that your system uses a heat pump, the configuration of the Nest Learning Thermostat would be the following:
I hope this can guide you a little better with this wiring configuration. If necessary, we recommend contacting a technician to be confident that your system works correctly.
Feel free to reply to this post. I'm here to find a solution for you.
Best regards,
Douglas.
