# Goodman Controller Board 3 Wire **URL:** \ **Category:** Home\ **Tags:** thermostat\ **Created:** [September 5, 2023, 5:14pm UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180 "2023-09-05T17:14:28Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![McCraig](https://avatars.discourse-cdn.com/v4/letter/m/9d8465/32.png) [@McCraig](https://forums.wyze.com/u/McCraig)\ **Post date:** [September 5, 2023, 5:14pm UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/1 "2023-09-05T17:14:28Z")
Greetings, I have an old controller board that only has three wires run to it, The W, G and R terminals. There are no Y or C. Can the Wyze thermostat be wired to work with this system? If so, what would the pinout look like. ![Goodman Control Board](https://us1.discourse-cdn.com/wyze/original/3X/a/6/a607533ec52e6fd46ac23660510ed8ccd69304b4.png) ---
**Author:** ![McCraig](https://avatars.discourse-cdn.com/v4/letter/m/9d8465/32.png) [@McCraig](https://forums.wyze.com/u/McCraig)\ **Post date:** [September 5, 2023, 5:20pm UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/2 "2023-09-05T17:20:32Z")
Board Picture ![goodman Control board](https://us1.discourse-cdn.com/wyze/original/3X/b/2/b23be3aa81d9fd0f6438bba2a8254c589f36335d.jpeg) ---
**Author:** ![SlabSlayer](https://avatars.discourse-cdn.com/v4/letter/s/f19dbf/32.png) [@SlabSlayer](https://forums.wyze.com/u/SlabSlayer)\ **Post date:** [September 5, 2023, 6:24pm UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/3 "2023-09-05T18:24:12Z")
I see that the W, G and R terminals are labeled on the upper left of the board, but where is the Bus Bar for the wires that insert from the existing thermostat? You are going to need the C Adapter, but I’m not sure about how the Y wire on the C Adapter will connect at the board since the Y is connected at the Condensing Unit to the Thermostat. So you have a picture of the old thermostat wiring? Perhaps @speadie could take a look and comment. ---
**Author:** ![McCraig](https://avatars.discourse-cdn.com/v4/letter/m/9d8465/32.png) [@McCraig](https://forums.wyze.com/u/McCraig)\ **Post date:** [September 5, 2023, 7:07pm UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/4 "2023-09-05T19:07:27Z")
Thanks for a fast response! There is no bus bar for the wires from the thermostat. The wires are terminated with a spade connector and then pushed on to the control board. Cheers, Craig ---
**Author:** ![speadie](https://sea2.discourse-cdn.com/wyze/user_avatar/forums.wyze.com/speadie/32/106541_2.png) [@speadie](https://forums.wyze.com/u/speadie)\ **Post date:** [September 6, 2023, 12:32am UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/5 "2023-09-06T00:32:53Z")
C is blue on the transformer and is connected to chassis ground. Need to see actual wiring at the furnace board to recommend wire hookup. ---
**Author:** ![McCraig](https://avatars.discourse-cdn.com/v4/letter/m/9d8465/32.png) [@McCraig](https://forums.wyze.com/u/McCraig)\ **Post date:** [September 6, 2023, 1:34am UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/6 "2023-09-06T01:34:36Z")
Thank you so much for your time and attention. I will get a photo tomorrow and post it. Cheers, Craig ---
**Author:** ![McCraig](https://avatars.discourse-cdn.com/v4/letter/m/9d8465/32.png) [@McCraig](https://forums.wyze.com/u/McCraig)\ **Post date:** [September 6, 2023, 1:51pm UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/7 "2023-09-06T13:51:25Z")
Good morning. Here are the photos for the controller board. It appears to be wired according to the schematic that I uploaded first. ![20230906_073309](https://us1.discourse-cdn.com/wyze/original/3X/4/7/47e788b1c30ead851d393960747334a66665e8ed.jpeg) ![20230906_073348](https://us1.discourse-cdn.com/wyze/original/3X/8/3/83a41c2fb159c40e449af6178c26a4f1c5874f5a.jpeg) ![20230906_073428](https://us1.discourse-cdn.com/wyze/original/3X/e/5/e5d26d04bc8d805f30e34855b2cf37b54b761351.jpeg) ![20230906_073452](https://us1.discourse-cdn.com/wyze/original/3X/4/e/4e4e307c9cffbbf42017c0dce7adf4931b32ee86.jpeg) ---
**Author:** ![speadie](https://sea2.discourse-cdn.com/wyze/user_avatar/forums.wyze.com/speadie/32/106541_2.png) [@speadie](https://forums.wyze.com/u/speadie)\ **Post date:** [September 7, 2023, 1:10am UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/8 "2023-09-07T01:10:29Z")
![image](https://us1.discourse-cdn.com/wyze/original/3X/6/6/66d904debfd6615057efc20f112946194d379d58.jpeg) I need to see where these wires go. They should be spliced into the thermostat wiring somewhere. can you take a picture of that? ---
**Author:** ![McCraig](https://avatars.discourse-cdn.com/v4/letter/m/9d8465/32.png) [@McCraig](https://forums.wyze.com/u/McCraig)\ **Post date:** [September 7, 2023, 11:55am UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/9 "2023-09-07T11:55:55Z")
I traced them out of the furnace. There are connected via wire nuts to the same signal on the thermostat. R-R, G-G and W-W. If still needed I will get a photo after work. Thank you so much for your help! Cheers, Craig ---
**Author:** ![speadie](https://sea2.discourse-cdn.com/wyze/user_avatar/forums.wyze.com/speadie/32/106541_2.png) [@speadie](https://forums.wyze.com/u/speadie)\ **Post date:** [September 8, 2023, 2:08am UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/10 "2023-09-08T02:08:30Z")
I’m mostly looking to see where the Y wire is, and if you have any unused wires running between the thermostat and the furnace. A picture would be very helpful. It would also be helpful to get a picture of the wiring at your current thermostat. ---
**Author:** ![McCraig](https://avatars.discourse-cdn.com/v4/letter/m/9d8465/32.png) [@McCraig](https://forums.wyze.com/u/McCraig)\ **Post date:** [September 8, 2023, 2:47am UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/11 "2023-09-08T02:47:08Z")
Speadie, From my notes, the Y wire goes to the condenser with a white wire before the thermostat cable reaches the furnace. They split and go different directions. Life interfered tonight so I could not get a photo. I will upload tomorrow morning. Many thanks! Cheers, Craig ---
**Author:** ![McCraig](https://avatars.discourse-cdn.com/v4/letter/m/9d8465/32.png) [@McCraig](https://forums.wyze.com/u/McCraig)\ **Post date:** [September 8, 2023, 3:59pm UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/12 "2023-09-08T15:59:24Z")
Speedie, I got the photos this morning. I am not sure who installed this system but it is a rat’s nest. I traced all the wires from the thermostat and created a schematic from my findings. This is how it is currently wired, Let me know if you need anything else. Thanks again! Cheers, Craig ![20230908_080820](https://us1.discourse-cdn.com/wyze/original/3X/0/5/055f6e24b1f4a865a4b4f2fc21ebbd869fdf1897.jpeg) ![HVAC Schematic](https://us1.discourse-cdn.com/wyze/original/3X/9/e/9e6d1dbcad214c8b5aaa0dfe0851968066001a75.png) ![20230908_080759](https://us1.discourse-cdn.com/wyze/original/3X/c/3/c3570be8ea4f5ffccda59bb7686f99a1659148ef.jpeg) ---
**Author:** ![speadie](https://sea2.discourse-cdn.com/wyze/user_avatar/forums.wyze.com/speadie/32/106541_2.png) [@speadie](https://forums.wyze.com/u/speadie)\ **Post date:** [September 9, 2023, 1:35am UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/13 "2023-09-09T01:35:27Z")
Using the same/similar color wires contained in your schematic… connect the c adapter at the splice point as follows: ![image](https://us1.discourse-cdn.com/wyze/original/3X/d/8/d8146ca7db0497b2d30fcdb8072db431e51b91f6.png) Tell the wyze app that your old thermostat has the following wires: Y, Rc, G, W ---
**Author:** ![McCraig](https://avatars.discourse-cdn.com/v4/letter/m/9d8465/32.png) [@McCraig](https://forums.wyze.com/u/McCraig)\ **Post date:** [September 10, 2023, 3:00pm UTC](https://forums.wyze.com/t/goodman-controller-board-3-wire/275180/14 "2023-09-10T15:00:40Z")
Installed this morning and works like a champ! Many thanks for all your help. Cheers, Craig