no power to thermostat connector on circuit board


  #1  
Old 08-31-14, 03:43 PM
C
Member
Thread Starter
Join Date: Aug 2014
Posts: 21
Upvotes: 0
Received 0 Upvotes on 0 Posts
no power to thermostat connector on circuit board

my circuit board in my unit burned up and i replaced it. i am not getting any power to the red wire terminal that sends power to the thermostat. I can jump power from the low voltage wire from the transformer and it will work
 
  #2  
Old 08-31-14, 05:02 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 6,422
Received 75 Upvotes on 68 Posts
What do you have between these 2 points?
A fuse? float switch? duct mounted smoke detector? zone control board?
 
  #3  
Old 08-31-14, 05:11 PM
S
Member
Join Date: Feb 2014
Location: USA
Posts: 1,771
Received 0 Upvotes on 0 Posts
Double check your wiring to the board. Does it have led lights?
 
  #4  
Old 09-01-14, 11:28 AM
C
Member
Thread Starter
Join Date: Aug 2014
Posts: 21
Upvotes: 0
Received 0 Upvotes on 0 Posts
no led lights, the low voltage from transformer plugs into circuit board, goes through many different resisors and stuff, cannot follow, but no power getting to the power terminal for the thermostat on the board. the board is a ICM276 fan blower control
 
  #5  
Old 09-01-14, 11:48 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 62,078
Received 3,422 Upvotes on 3,068 Posts
Where does the transformer secondary (24) connect to the board ?
 
  #6  
Old 09-01-14, 12:02 PM
C
Member
Thread Starter
Join Date: Aug 2014
Posts: 21
Upvotes: 0
Received 0 Upvotes on 0 Posts
1/3 of the way down on the left side, two connectors, yellow and common
 
  #7  
Old 09-01-14, 12:12 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 62,078
Received 3,422 Upvotes on 3,068 Posts
Are those the X and C connections ?
Can you tell me what the 5 terminals are labeled as.... T7=? , T4=?
 

Last edited by PJmax; 09-01-14 at 03:01 PM. Reason: removed un-needed pic
  #8  
Old 09-01-14, 02:18 PM
C
Member
Thread Starter
Join Date: Aug 2014
Posts: 21
Upvotes: 0
Received 0 Upvotes on 0 Posts
yes the x & c. the five are from left t7-y t4-r t6-g t3-c t5-w. t4 is power to thermostat
 
  #9  
Old 09-01-14, 02:51 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 62,078
Received 3,422 Upvotes on 3,068 Posts
Looking at the remarked board..... you need something to close the R to X jumper at the plug. I don't know what you have.... maybe a safety switch is open.

Name:  267 - Copy.jpg
Views: 1533
Size:  42.1 KB
 
  #10  
Old 09-01-14, 07:51 PM
C
Member
Thread Starter
Join Date: Aug 2014
Posts: 21
Upvotes: 0
Received 0 Upvotes on 0 Posts
Thank you PJmax. those connectors went to the overheat sensor for my gas heater and it was tripped. must have had a surge when the board melted. working fine now.
 
  #11  
Old 09-01-14, 07:59 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 62,078
Received 3,422 Upvotes on 3,068 Posts
Great news...... well done.
 
 

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