Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

2 Answers

Curtailment active The first time we turned on the AC mode on a new Infinity system the control panel said CURTAILMENT ACTIVE.  Don't know what that means but i do know that the AC won't cool AT ALL!!!  All winter the system worked perfectly in heat mode.  Now nothing in AC mode.  What's up? Thanks for any help you might be able to provide. Wilting in SC

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  • Anonymous May 19, 2009

    I had this same problem and the fix above worked. Thanks

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2 Answers

A follow-up to my previous post. I talked with a technician from the Co that installed my unit, and the issue lies in the "Utility saver mode" for the 2 stage heat pumps, and having the high stage locked out. In the Advanced Setup menu (hold the "Advanced" button for 10 seconds to access this menu, look for the "Utility Saver" menu item. Select it and your system probably shows that "Utility Saver" is enabled, which only allows your heat pump to run on the low stage and not the high stage. If you change the the setting to be disabled, this will allow your system to run at the high stage and should solve your problem.

I have not changed the settings on my system yet to confirm this solution. That will have to wait until I get home this evening.

Posted on May 19, 2008

  • Samuel S WALTERS
    Samuel S WALTERS Jun 07, 2011

    THANKS! It was 92 in Minneapolis today and it got up to 89 inside the house before I found this post which solved my problem immediately.
    So sad that the manufacturer's web site had nothing about this.

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I have the same problem and have only found indicators of the cause but no solutions.

From an installation manual found online at: http://www.carrierwest.com/PDF/Operation_Service/24ana-3si.pdf

I discovered this note on page 9:

Utility Interface
With Infinity Control
The utility curtailment relay should be wired between R and Y2
connections on the control board for Infinity Communicating
Systems only (see Fig. 9.) This input allows a power utility
device to interrupt compressor operation during peak load
periods. When the utility sends a signal to shut the system down,
the User Interface will display, “Curtailment Active”.

Posted on May 19, 2008

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