Carrier 50QE900-NPWS Wiring with BOW together


Old 04-19-18, 12:47 PM
Thread Starter
Join Date: Apr 2018
Location: minneapolis
Posts: 1
Received 0 Votes on 0 Posts
Question Carrier 50QE900-NPWS Wiring with BOW together

I'm attempting to replace my current non-programmable thermostat with a new Honeywell RTH6360. When I pulled the older Carrier off, I documented the wiring per instructions with a blue wire going to a slot labeled BOW1, but when plugging in the new UWP, I saw B/O and W were separate. I've tried plugging into each and neither kicks on the heat. Do I potentially need a jumper or something?

Name:  t1.jpg
Views: 265
Size:  55.8 KB

Name:  t1a.jpg
Views: 726
Size:  70.8 KB

Last edited by PJmax; 04-19-18 at 04:22 PM. Reason: reoriented pics
Old 04-19-18, 02:29 PM
Join Date: Feb 2014
Location: USA
Posts: 2,101
Received 0 Votes on 0 Posts
Jumper between O/B and W.
Old 04-19-18, 04:25 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 60,824
Received 1,330 Votes on 1,229 Posts
Welcome to the forums.

It's W or B/O function depending if you have a heat pump or a split A/C system and furnace.

On the new stat.....
If you have a furnace and split A/C..... you use W.
If you have a heat pump system.... you use O/B.

If you have a Ruud or Rheem heat pump..... you'd need to change the O/B programming to B. O is the normal default setting.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: