Question about Carrier 38CKC030 Air Conditioner

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I have a Carrier thermostat model TB-NHP01 and just installed it. Went to change the temperature and the screen went blank and stays blank. Bought this one to replace previous one which had the same

Screen is blank, buttons seem to do nothing. Furnace, however, does continue to run - you just can't change the temp. It appropriately cycles on and off. This new thermostat is non returnable so can someone point me in the right direction please? Thanks!

Posted by dkupski on


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  • 75 Answers

SOURCE: Carrier Infinity DC motor drive problems

Contact the company that installed the unit. Its new, under warranty, Anything you do could void the warranty. If they do not take care of the problem without charges contact Carrier and tell them what's going on. The company who installed the unit is responsible for making it run correctly. Good luck. kstfas

Posted on Aug 27, 2007



  • 163 Answers

SOURCE: 3 amp fuse blows on a carrier 58mcb furnace board

Hi!!! Does your ac unit work fine?If not check your low voltage problem..You have a low voltage problem check the wire going out to your condensor make sure that they are not touching..Good luck..Check low voltage wires..short in progress..

Posted on Jan 04, 2009


Nathan Ellsworth

  • 92 Answers

SOURCE: Carrier thermidistat screen went blank

Check the battery in the thermostat it is dead!! Should be 2 AA batterys!

Posted on Sep 12, 2009


  • 614 Answers

SOURCE: blank thermostat

Check voltage at unit. Also check the 5 amp fuse in the unit. If this unit has a float switch in the drain line check that. Rus

Posted on Dec 03, 2009

little bulls

  • 22 Answers

SOURCE: Blank readings on Carrier Comfort 3 zone thermostat

The stat that works is called the main and the other two are called slave stats. The stats must be set to heat or cool the same as the main. If you want one room to cool and one to heat , sorry. Need to upgrade to auto changeover. Is this AC actally a Heat pump?

Posted on May 06, 2010

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Go to
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need

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