no power to thermostat connector on circuit board


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Old 08-31-14, 03:43 PM
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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
 
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Old 08-31-14, 05:02 PM
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What do you have between these 2 points?
A fuse? float switch? duct mounted smoke detector? zone control board?
 
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Old 08-31-14, 05:11 PM
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Double check your wiring to the board. Does it have led lights?
 
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Old 09-01-14, 11:28 AM
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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
 
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Old 09-01-14, 11:48 AM
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Where does the transformer secondary (24) connect to the board ?
 
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Old 09-01-14, 12:02 PM
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1/3 of the way down on the left side, two connectors, yellow and common
 
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Old 09-01-14, 12:12 PM
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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
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Old 09-01-14, 02:18 PM
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yes the x & c. the five are from left t7-y t4-r t6-g t3-c t5-w. t4 is power to thermostat
 
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Old 09-01-14, 02:51 PM
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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.

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Old 09-01-14, 07:51 PM
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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.
 
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Old 09-01-14, 07:59 PM
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Great news...... well done.
 
 

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