A/c will only run when t/stat set to on position

Reply

  #1  
Old 06-25-14, 10:04 AM
H
Member
Thread Starter
Join Date: Jun 2014
Location: usa
Posts: 2
Received 0 Votes on 0 Posts
A/c will only run when t/stat set to on position

I have what I believe to be a Coleman/York Furnace, Model # G8T08012UHA11A. The a/c unit (outside) will not function if the t/stat is set to AUTO, however, it runs fine when set to the ON position - ie: if I set the temp to 70 the unit cools the house until it reaches that temp, the compressor shuts down and the fan continues to run. We believe the t/stat is ok, however, it is using batteries like crazy, so my hubby thinks we should replace the board inside the furnace, part #031-01267-001. BTW, the heat works properly when set to AUTO position...Any recommendations? Should we try to replace the t/stat first? Thanks in advance.
 
Sponsored Links
  #2  
Old 06-25-14, 10:21 AM
Bob14525's Avatar
Member
Join Date: Jun 2013
Location: USA
Posts: 1,523
Received 20 Votes on 15 Posts
I'm suspicious of the thermostat itself, particularly because it's very hard on batteries. Most thermostats have small relays that connect the various wires running to the furnace/AC unit. The circuitry inside the the thermostat is not directly connected to the furnace control board. The thermostat circuitry merely controls which relays are enable or disabled.
 
  #3  
Old 06-25-14, 10:55 AM
H
Member
Thread Starter
Join Date: Jun 2014
Location: usa
Posts: 2
Received 0 Votes on 0 Posts
Thanks Bob14525...we will try replacing the t/stat first!
 
  #4  
Old 06-25-14, 12:44 PM
HVAC RETIRED's Avatar
Member
Join Date: May 2008
Location: Wisconsin USA
Posts: 715
Received 0 Votes on 0 Posts
I am wondering how the thermostat could ever have been wired so that situation could happen...
 
  #5  
Old 06-25-14, 01:53 PM
S
Member
Join Date: Feb 2014
Location: USA
Posts: 2,104
Received 0 Votes on 0 Posts
Setting the stat to AUTO should have no effect on the condenser.
 
Reply
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


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