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

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Zoned system one zone not working

I have a carrier 4 zone system and one zone displays " - - " in the current temperature space. The book says this means the sensor is bad in that zone. The result is no heat in that zone. This happened once before and I got it to reset but this time it won't. Has anyone had this problem

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I hit the reset button on the main unit and that reset all the sensors. It was so easy but when I called Carrier's customer service line they told me there was nothing they could recommend. Not very good customer service. Avoid Carrier brand if possible.

Posted on Jan 23, 2009

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1 Answer

Carrier Comfort Zone II Thermostat is blank and the 3 companion thermostats are all showing Error Code C1. What does that mean?

Hi Anonymous,
For all wall mounted and Artcool split system codes

Error code = C1 or CH1
Flashing Light = 1
Fault = Indoor temperature sensor open or closedcircuit.
Display = Indoor.
Indoor Operation = ON

Error code = C2 or CH2
Flashing Light = 2
Fault = Outdoor temperature sensor open orclosed circuit.
Display = Indoor Outdoor.
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Our Carrier Comfort Zone II thermostat, which has 2 zone readouts, currently shows a temperature of 00, as in zero zero, on one zone. That is the main zone for our home. Zone 2, for spare bedrooms, etc....

This .pdf file may be of help to you:'s%20Guide.pdf
Perhaps you could get some help from Carrier Support here:
I noticed they have an option of talking to an engineer, and perhaps they could explain how to reset or set the unit.
Hope this helps.

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1 Answer

Looking for auto restart on carrier 40GKX series

Can you please check if the remote handset is this?d6f691e.png if yes, follow below

• Connect the system to the electrical current.
• Press the button M and of the remote control and keep them pressed down for at least
5 seconds.
• The clock digits show the first configuration item (rAdr = remote address) and the temperature
digits show the default value of the respective configuration item (Ab = control of both indoor
• Press the button M repeatedly until "ASt " appears.
• Press the buttons ∧ or ∨ to change the default value (OF) to the new value (ON).
• Press the button to send the new configuration to the unit.
• Press the button to exit the configuration menu.
To see other available configuration options, consult the table.

Item Viewfinder display Explanation Description

1 "rAdr" "A": remote unit A Remote address of indoor unit A.
"b": remote unit B Remote address of indoor unit B.

"Ab": remote units A and B Default address of the two units.
2 "UCFG" "HP": Heatpump Default address and heatpump
"AC": Cooling only Changes the cooling-only address

3 "UAdr" 1-240 with an increment of 1 Address of the CNN unit.
Default = 1.

4 "ZONE" 1-240 with an increment of 1 Zone number.
Default = 0.

5 "GFdn" 1-240 with an increment of 1 GFD number.
Default = 1.

6 "A St" "OF" : Shutdown mode Select the function mode after an
"On" : Automatic restart electrical power failure.

If no button is pressed for 30 seconds, the remote control automatically exits the
configuration menu and the entire procedure must be restarted.

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1 Answer

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We have the same problem, was hit with lightning and came up E1

You didn't get a Carrier tech. Carrier technicians only work on commercial equipment. Residential applicaitions, installation and service of Carrier residential units are done by dealers. They are not carrier owned but get buy the product at discount get training and get to show our logo. You can't fix the boards, they have to be replaced. It sounds like you have a Gen II VVT system. You can get the part via Totaline stores or a distributor. You will need to know how to readdress the other controllers to operate correctly. Use

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Carrier furnace

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Carrier 38TXA030 not working

That sounds like a very efficient system Gratz. You can try a reset by throwing the breakers off and back on and check all your micro fuses on boards and zone controllers. GL!

Jun 11, 2008 | Heating & Cooling

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