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Hi Stem I tried the way you described but it did not work. Basically there are two cable connected at port 4 in old programmer. The red wire connected on port 3 was from the digital thermostat (honeywell). I dont know why it was connected there.Because I am going to fix new nest thermostat, I...

Thanks buddy your way of explaining whole thing is really good. I really appreciate you. Once job done, I will let you know the result. Thank you.

Hi Stem thank you very much. One question here. If those two wire (red and black) which connects the wall thermostat (honeywell), are no longer required, can I not just simply disconnect it and get rid of it rather put it into junction box? I m sorry if I am wrong, but I m not getting your point...

Hi stem here it is, I have attached photos of thermostat which is other side of the wall. There are two connection to it. Now if you can help me where to join these cables. I hope this will sort out my problem. Many many thanks for your help. Can I ask you a question? Are you an electrician?

Hi Stem, Thank you for your response and sorry for hijacking someone else post but I was not aware how to start so I just posted here. Yes I do have existing room thermostat which is other side of the wall. I think those wire will go to heat link T1 and T2 as those are direct connection. Am I...

hi stem, I do have similar system. Please check below pics for more info. If you can help me as well to install nest heat link my self https://photos.google.com/photo/AF1QipMULGyIIAXxEhwRb2KnEMw76RrW6m14wis2vdwX https://photos.google.com/photo/AF1QipOL1Z3RL3xi7idHeeLIxPuBrD8ae0gzQTwgNlj_ thank...