Question about Carrier 38CKC042 Air Conditioner

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The Carrier comfort zone thermostst displays the

The Carrier comfort zone thermostat displays the SF 03 message on all 3 zones.

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Go to panal and reset control. Small reset button on control board. Let me know if it clears.James

Posted on Mar 25, 2010

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Posted on Jan 02, 2017

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2 Answers

In the cooling mode for zone 1, why won't the temperature stay as set on the cool setting?


If it 2 degree cooler then that's fine .adjust your thermostat 2 degrees higher so you will get the temperature

Feb 16, 2018 | Carrier Heating & Cooling

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.
Indoor Operation = ON

Feb 14, 2015 | Carrier Heating & Cooling

1 Answer

I have a Carrier Comfort Zone II with 2 controlled zones. The floor with just the sensor controls perfectly. I set that zone at 75 and it stays at 75. The other zone has the actual thermostat. If I se


Sounds to me like a bad damper or a bad zone panel. Turn tstat off and call for cooling on zone 2. Then see if your still getting cool air to zone 1.( where the main tstat is)

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Jul 15, 2017 | Heating & Cooling

2 Answers

I turn the heater....it displays A04..and then it shuts off.


Comfort Zone heaters do not have a display board, they only had thermostat knobs.


Is it possible that you have a different model of heater?

Dec 23, 2010 | Comfort Zone Pool & Spa

1 Answer

My comfort zone infrared hearter has a display message of A05 and will not run, what does that mean? How can I fix it?


Hi. I have the Comfort zone 1500 (cz 1500) and just ran into this AO5 problem. Turns out the thermostat was set lower than the actual room temperature. I just turned up the heater temp and it kicked right on. Hope this helps!

Nov 16, 2010 | Comfort Zone Heating & Cooling

2 Answers

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:
www.brivis.com.au/.../Carrier%20Comfort%20Zone%20II%20Owner's%20Guide.pdf
Perhaps you could get some help from Carrier Support here:
http://www.residential.carrier.com/support/index.shtml
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.

Sep 25, 2010 | Heating & Cooling

1 Answer

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?

Jul 01, 2009 | Carrier 38CKC042 Air Conditioner

1 Answer

I get the error code E2 It only shows 2 zones on my 4 zone syst


I reset the circuit breaker to the panel and everything is good now.

Jun 24, 2009 | Carrier 38CKC060 Air Conditioner

1 Answer

Thermostat issue with comfort zone II.


Is this an electric or gass furnace - Eather of these can can have this problem its most recomendable that you call a seviceman .
in the case of electric furnace you may requier a new heat sequencer. And in the case of gass you may requier a new relay.

Feb 18, 2009 | Carrier 38CKC060 Air Conditioner

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