Go Back  DoItYourself.com Community Forums > Heating, Cooling, Air Conditioning, Ventilation and T-Stat Controls > Gas and Oil Home Heating Furnaces
Reload this Page >

Please Help, after switch G/Gree wire to C terminal, the A/C won't turn anymore

Please Help, after switch G/Gree wire to C terminal, the A/C won't turn anymore

Reply

  #1  
Old 06-01-14, 08:31 PM
Member
Thread Starter
Join Date: Jun 2014
Location: canada
Posts: 6
Please Help, after switch G/Gree wire to C terminal, the A/C won't turn anymore

I just bought a Honeywell Wifi thermostat today, but after trying for hours, the system just won't turn the A/C on.

what I did on the thermostat was

BLACK --> Y
GREEN --> C
RED ---> RC/RH
WHITE --> W

and in my furnace the original wiring was

Red --> R
GREEN --> G
WHITE --> W
the only thing different is the black wire from thermostat was connected to the black wire from the air conditioner and the white wire from air conditioner was connected to the C on the furnace control board.

so after I switched the Green wire to C, and jumped the Y and G, the A/C system just can't be turned on for some reason, is anyone there can give me some help, thanks a lot!

Name:  Photo 2014-06-01, 11 07 32 PM.jpg
Views: 845
Size:  40.0 KB

thanks again
 
Sponsored Links
  #2  
Old 06-02-14, 03:59 AM
Member
Join Date: Feb 2014
Location: USA
Posts: 2,103
Green wire goes on G terminal on the stat. Black wire goes straight to the AC unit.
 
  #3  
Old 06-02-14, 09:05 AM
Member
Thread Starter
Join Date: Jun 2014
Location: canada
Posts: 6
but since it's a wifi thermostat, I need to have the G wire hook up to the C for power, that's the problem.
 
  #4  
Old 06-02-14, 09:24 AM
Member
Join Date: Feb 2014
Location: USA
Posts: 2,103
The only way to make this work is you need one more wire up to the stat. I know that isn't what you want hear, but that is the only way. Pull the stat wire out of the wall a little and make sure you don't have a spare wire.

The way you have it wired now the AC and furnace blower should turn on. The problem is the only time the blower will run is in cool mode. I would check the fuse on the control board.
 
  #5  
Old 06-02-14, 07:49 PM
Member
Thread Starter
Join Date: Jun 2014
Location: canada
Posts: 6
it's nearly impossible to add another wire, it looks like that I have to return the thermostat then.

thanks
 
  #6  
Old 06-03-14, 09:13 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 50,693
Likes Received: 115
BLACK --> Y --> Y and G (terminals at furnace)
GREEN --> C --> C
RED ---> RC/RH --> R
WHITE --> W --> W
 
  #7  
Old 06-03-14, 12:35 PM
Member
Thread Starter
Join Date: Jun 2014
Location: canada
Posts: 6
thank you for your reply.

and where the two wires from A/C suppose to go into(they are in the furnace)
 
  #8  
Old 06-03-14, 04:33 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 50,693
Likes Received: 115
BLACK --> Y --> Y and G (terminals at furnace) --> to outside A/C compressor unit
GREEN --> C --> C --> to outside A/C compressor unit
RED ---> RC/RH --> R
WHITE --> W --> W
 
  #9  
Old 06-04-14, 06:02 AM
Member
Thread Starter
Join Date: Jun 2014
Location: canada
Posts: 6
thank you so much, that's what I did at first. But last night I found out why it didn't work was because the newly installed thermostat will wait 5 minutes to start the cooling equipment for protection purpose.

thanks again for your help
 
  #10  
Old 06-04-14, 08:34 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 50,693
Likes Received: 115
Many thermostats will blink the word cool or cooling when in that wait period.
 
  #11  
Old 06-04-14, 03:26 PM
Member
Thread Starter
Join Date: Jun 2014
Location: canada
Posts: 6
I was too stupid to notice that, and my previous thermostat didn't have that function.

but it all ends well now, thank you again.
 
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
Display Modes