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Old 06-25-2012, 03:37 PM   #1
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carrier control board won't send 24 v to outside contactor


Carrier hk42fz009 keeps flashing...blower runs constantly ...replaced thermostat then board...same blinking issue...switched leads from transformer ...no help...push contactor in..unit runs...cannot figure out why I'm not getting 24 to coil..hv 24 goin to board ...but not out to coil...confused

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Old 06-25-2012, 03:58 PM   #2
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carrier control board won't send 24 v to outside contactor


check the wires

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Old 06-25-2012, 04:49 PM   #3
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carrier control board won't send 24 v to outside contactor


Checked checked and rechecked wiring from schematic on unit and new control board
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Old 06-25-2012, 05:19 PM   #4
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carrier control board won't send 24 v to outside contactor


Can you explain better your problem??

blower runs constantly????
? Fan on or Fan off switch / Call for cooling

same blinking issue????? Which error code

I'm not getting 24 to coil
..... contactor low voltage at the condenser right?

Why did you change thermostat and board????
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Old 06-25-2012, 05:34 PM   #5
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carrier control board won't send 24 v to outside contactor


remove the stat off the subbase(shut the line power off out on the condenser) FAN OFF or ON? at the subbase jump R to Y then check contactor outside?should be pulled in.as you jump and un jump R/Y that contactor should bang in and out...get a pair of eyes out there to yell out whats happening.if nothing leave the stat off the wall jump the board at R/Y see what happens if it pulls in there is an open wire between the furnace and the stat.that constant fan remove G first on the subbase? then go down to the furnace board and remove G either shuld drop the fan out?lets here back...
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Old 06-25-2012, 06:11 PM   #6
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carrier control board won't send 24 v to outside contactor


The board doesn't send power to the outdoor unit. the thermostat does.
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Old 06-26-2012, 12:02 AM   #7
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carrier control board won't send 24 v to outside contactor


Do you have 24v coming back from the stat to call for condensor to come on?
If your furnace has a terminal board/junction block check for 24v between y and common.
If the low voltage wires are just spliced/dangling check for 24v between your yellow or blue depending on how its wired and the common side of the low voltage wiring.
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Old 06-27-2012, 03:13 PM   #8
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carrier control board won't send 24 v to outside contactor


No voltage on board from Y to C when energized ...none nothing on any terminals when therm is off....have 27 goin to board ...blower runs...nothin else happens ...tried another. therm as well...light keeps flashing as if reversed polarity ...don't see it
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Old 06-27-2012, 03:15 PM   #9
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carrier control board won't send 24 v to outside contactor


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Originally Posted by plummen View Post
Do you have 24v coming back from the stat to call for condensor to come on?
If your furnace has a terminal board/junction block check for 24v between y and common.
If the low voltage wires are just spliced/dangling check for 24v between your yellow or blue depending on how its wired and the common side of the low voltage wiring.
No volt reading on board whether therm is calling or not
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Old 06-27-2012, 03:17 PM   #10
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carrier control board won't send 24 v to outside contactor


Quote:
Originally Posted by plummen View Post
Do you have 24v coming back from the stat to call for condensor to come on?
If your furnace has a terminal board/junction block check for 24v between y and common.
If the low voltage wires are just spliced/dangling check for 24v between your yellow or blue depending on how its wired and the common side of the low voltage wiring.
I'm not gettin anything on board from therm..blower just runs ..no Y to C either
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Old 06-27-2012, 03:19 PM   #11
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carrier control board won't send 24 v to outside contactor


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Originally Posted by beenthere View Post
The board doesn't send power to the outdoor unit. the thermostat does.
Board doesn't seem to receive anything from therm...tried two different thermostats
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Old 06-27-2012, 03:44 PM   #12
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carrier control board won't send 24 v to outside contactor


Quote:
Originally Posted by JJboy View Post
Can you explain better your problem??

blower runs constantly????
? Fan on or Fan off switch / Call for cooling
Runs on auto and on constant

same blinking issue????? Which error code

nondescript ..I believe reversed polarity

I'm not getting 24 to coil
..... contactor low voltage at the condenser right?


Why did you change thermostat and board????
no reading from thermostats wire on board
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Old 06-27-2012, 04:13 PM   #13
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carrier control board won't send 24 v to outside contactor


Quote:
Originally Posted by biggles View Post
remove the stat off the subbase(shut the line power off out on the condenser) FAN OFF or ON? at the subbase jump R to Y then check contactor outside?should be pulled in.as you jump and un jump R/Y that contactor should bang in and out...get a pair of eyes out there to yell out whats happening.if nothing leave the stat off the wall jump the board at R/Y see what happens if it pulls in there is an open wire between the furnace and the stat.that constant fan remove G first on the subbase? then go down to the furnace board and remove G either shuld drop the fan out?lets here back...
tried....unable to jump..r to y or anything....contactor only closes when
Pushed in manually
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Old 06-27-2012, 04:25 PM   #14
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carrier control board won't send 24 v to outside contactor


Did you try jumping the red and yellow wires at the thermostat. m ay be your thermostat wires are broken.
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Old 06-27-2012, 04:29 PM   #15
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carrier control board won't send 24 v to outside contactor


Quote:
Originally Posted by biggles View Post
remove the stat off the subbase(shut the line power off out on the condenser) FAN OFF or ON? at the subbase jump R to Y then check contactor outside?should be pulled in.as you jump and un jump R/Y that contactor should bang in and out...get a pair of eyes out there to yell out whats happening.if nothing leave the stat off the wall jump the board at R/Y see what happens if it pulls in there is an open wire between the furnace and the stat.that constant fan remove G first on the subbase? then go down to the furnace board and remove G either shuld drop the fan out?lets here back...
tried....unable to jump..r to y or anything....contactor only closes when
Pushed in manually

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