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Discussion Starter · #1 · (Edited)
:eek: Hi, Green Newbie Here. Have a Gas Heat & A/C unit combined. Carrier Model 58GEC065-08; Originally installed in 1989; Single phase 115 volt, 60 Hz

I am reading and reading all your great posts but can't find the answer to my problem and I don't know enough to read between the lines. Forgive me in advance if (when) I say anything totally stupid...

I installed a new ICM271 about 6 months ago. :thumbsup:All was great...It fixed my heat & blower perfectly:thumbsup: BUT... I did not think to check the a/c back in the super cold times...:blush:

well the a/c-condenser fan- doesnt come on at all. My huband was so proud of me for fixing the heat, but now no a/c... We can't afford to call someone out here right now. Hope someone can help me...:detective:

I tested the power when asking for a/c and I am getting 24 volts between y - gh and also y - r. Thats all. Shouldn't I be getting 24 volts between y and gc??

When I ask for heat -everything works great. I checked the voltage so I could post that info too...When asking for heat, I am getting 24 volts between w - c; r - y; w - y; and gc - w.

Also, my wiring at the thermostat is w to w; y to y; g to g; rc and rH are jumped; and c to b (b is black, I have 5 wires and one is black)

The wiring at the contol board is w to w; y to y/r; gc to gh (supposed to be jumped on the ICM271 control board); r to r; and c to w/b (b - black)

Thanks for any help, Karen

btw: I bought the board at an appliance website listed on "samurai appliance" website
 

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Discussion Starter · #3 ·
Hello beenthere, Have seen your postings and much respect for your generosity and knowledge.

I am sorry that I don't understand what you mean, just too new to all of this...All of the readings I gave were with the thermostat set below what the room temp, by at least 5 degrees; to get the "reaction" of heat/cooling to begin;

also, I did turn on the breaker for the a/c before and again off/on after the testing...sure it is not being tripped.

Thank you so very much for getting back to me so fast...what else can you think of??? Respectfully yours and thanks, Karen
 

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Discussion Starter · #4 ·
Please be blunt and tell me to post whatever may help

Please tell me to post whatever you think may help...please be patient with me...Really need help and want/fully intend to follow any direction you give me. Appreciate and thank you for your time, Karen
 

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Discussion Starter · #6 ·
Rechecked voltage and connections are secure

Thanks. I rechecked again with the thermostat set to 10 degrees below the room temp...calling for cool, the results were the same voltage between y - r and y - gh.

I know there should be no power between gh and y and I need power between gc and c... right?

I dont know which wires to move on the thermostat or control board to make that happen.

The thermostat is digital. It is a Lux TX9000TS.

I need help switching out the wiring without killing something or someone.

I think the problem has to do with the fact that the board has gh gc and the thermostat has rh rc...but I don't know how to compensate for that. Maybe a call to Lux tech support?

I also :eek: double checked for tightness of connections.

Thanks for your help, Karen
 

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Discussion Starter · #8 · (Edited)
Here is how it is wired now

Thermostat labels: W Y G RC RH C

My thermostat wires: W Y G R jump R B

My control board wiring
from thermostat and two
power wires R and W: W Y/R G jump GH R B/W
 

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Discussion Starter · #10 · (Edited)
Trying to get this lined up better

W Y G RC RH C thermostat color labels

W Y G R jump R B my wires to thermostat

W Y/R G R B/W wires into control board


W Y GC GH R C control board color labels
 

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Discussion Starter · #12 ·
Oh....Then maybe I have to cut the jumper on the control board...the control board has the gh gc jumper "built in". It is called the JW1 jumper on the instruction sheet. The instructions say not to cut this jumper if you have a/c.

Should I go ahead and cut it anyway??????????8|

Here is the manual's excerpt of confusing instructions:
"The ICM271 has the same features and functions as the current Carrier/BDP replacement (HH84AA020). The ICM271 has additional optional features and some slight operational differences than the older obsolete Carrier/BDP units. These options and operational differences are listed below.
Note: Some older Carrier models did not have a cooling fan relay.
1. On older Carrier/BDP models, the low-speed blower would still function if the 24 volt transformer malfunctions. This will not happen with the ICM271.
2. If the JW1 jumper is cut, a constant low-speed blower will occur without any thermostat signal. Also, a signal applied to the GC or Y terminals will not bring on the hi-speed blower during the cooling mode. Therefore, the JW1 jumper must not be cut on cooling applications."

http://www.icmcontrols.com/downloads/icm271_ag.pdf
 

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Discussion Starter · #14 ·
Here is something even more confusing (to me anyway)...the wiring diagram is different and shows r jumped to gh. Also does it look like the gh gc is cut?? I don't know how to interpret this:(


 

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Discussion Starter · #15 ·
Wait, I missed what you posted..."Control board R should be jumper to control board GH"!!! I do not have this jumped! :w00t: I am going to go do it right now.

Thank you Beenthere! Oh man I hope this is it...
I'll be back! (after I try it)
 

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Discussion Starter · #17 ·
Beenthere Fixed It!!!!!!!!!!!!!!!!!!!!!

:thumbup::thumbup: I am dancing around the house...Dancin, dancin, dancin, she's a dancin machine:thumbsup::thumbsup::thumbsup:

Beenthere, you are the man! :sorcerer:Thank you! Did I mention how happy I am right now? I already called my husband, he is so happy too.
 

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Discussion Starter · #18 ·
So I did what you said first, jumped the GH to the R put the power back and turned it on and nothin...BUT then after about 90 seconds and the snowflake started flashing!!! and then the condenser came on and it is all fixed and heat & A/C both work perfect! Still no power between y and c but now there is power between c and gh, when calling for the cooling.

Thank you again, Beenthere. What a great feeling to have that fixed correctly now. :)Karen:)
 

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Discussion Starter · #22 · (Edited)



I am so happy right now :whistling2: Company is coming over and beenthere's ears should be burning tonight. Can't wait to tell them about how he helped me fix my HVAC problem.

Sure I can post pic(s)...maybe too many? can you tell I'm proud?
Beenthere is my hero, Karen

BTW: Those extra two wires that are wire nutted (first pic) are from the new transformer I put in. They don't make the exact old one I had that only had four wires.
 

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Discussion Starter · #26 ·
You are so funny...Kenmac,
Dancin machine is a private showing, for my husband's eyes only:tongue_smilie:
But Beenthere is my hero!
:shifty:
 

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Discussion Starter · #31 ·
The two incoming from the a/c outside are red and white. You can see a good pic of it posted. The furnace board is marked: c y gc gh r w (from left to right). The red from outside is wired to the y of the furnace, together with the yellow wire from the thermostat. The white from the outside is wired to the c of the furnace, together with the black from the thermostat.

Your wiring colors may be different.

You need to ask Beenthere any questions you have about this, he is
THE MAN!

You are dealing with 220 volts at points inside the furnace...be careful, and post some pics to make it easier for Beenthere to see what you have.
 

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Discussion Starter · #34 ·
You know it always takes almost 2 minutes for my a/c condenser to start up...how long did you wait?

Carefully go back over Beenthere's instructions...these in particular:

"Thermostat should have a wire(usually red) on RC or RH, with a jumper to the opposite terminal.
Another wire should be on the C terminal(could be black, blue or some other color).
Then a wire on the W terminal(usually white)
One on the G terminal(usually green)
And one on the Y terminal(usually yelow)

On the furnace control board(ICM271)
R terminal should have the wire that connects to the stat RH/RC
Control board R should be jumper to control board GH
Control board W terminal should have the wire that connects to the stats W connected to it.
Control board GC should have the wire that connects the stats G terminal connected to it.
Control board Y terminal, should have the wire that connects to the stats Y teminal, along with one of the wires from the A/C outside unit.
Control board C terminal should have the wire from the stat that is connected to the C terminal connected to it, along with the other wire from the A/C outdoor unit.

Don't jumper control board GC and GH together. "
 

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Discussion Starter · #36 ·
I feel for you Rajon. :wallbash:
If I were you I would start a new post in HVAC with "BEENTHERE please help" in the title. Include a couple pics if you can.
Hope you get it fixed, Karen
 
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