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

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Carrier ducted heater

  1. The units fans all work when the unit is on, but the burner's don't ignite to warm the home, please help kids ar nt happy 2yr old girl and 8 yr old boy

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Ignition system may be your problem. Call for service.

Posted on May 01, 2008

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When I turn it on to the heat cycle the fan does not run, I have swapped the control board with another unit that was working and still get the same result the unit runs on all other cycles.


This is not true if your system is a heat pump. When the thermostat calls for heat, and the burner ignites the gas, a thermal sensor switch senses when the hot box has heated and then the sensor turns the fan on, this is so no cold air is blown into the ducts and living space. Also, another sensor senses the heat box if it gets too hot, cuts out the burner, if this sensor is not working then the burner will never light. Two sensors that may be keeping the heat from working among other possible causes, one step at a time in trouble shooting. Does the burner turn on at all?

Apr 25, 2015 | Heating & Cooling

1 Answer

I have a Vulcan Ultra 21E ceiling ducted unit The LED flashing fault is no 8 which is a gas interruption. The unit fan runs, ignition starts full flame and gas flows for about 2 secs then shuts down The...


Just been thru a similar problem with my Climate Technologies Vulcan High Efficiency Ducted Gas heater which in this case is installed under the house. This heater is about 7 years old and I have previously (2 years back) refurbished the controller by replacing the main power supply electrolytic filter capacitors.

I also had a communication problem with the Touch pad Thermostat which in the end required replacing the entire touch pad as one of it's voltage regulators had gone intermittent (Touch pads are available on E-Bay). To operate the heater while the touch pad was out of commission I installed a manual switch between the heat contacts on the heater controller. Closing the switch causes the heater to permanently run if it has no thermostat. Once communication with the touch panel was restored we were able to try and find the intermittent heater fault.

Again I have been getting Fault Code 08 "Gas Interruption" however the heater was lighting OK and then going out after about a minute or so. In the end I found 2 distinct heater faults.

Fault 1 was the flame sensor where the weld between the wire and flame probe rod had broken but it was still touching. This meant it was sensing Flame OK and then later would go open with expansion as the temperature rose. I fixed this by replacing the Flame Probe with a new one sourced from Reece HVAC.

At this point I celebrated thinking it was fixed!

Fault 2 after the flame sensor issue was cleared the fault still persisted but slightly less often.
The heater was cycling 3 times to get going and then locking out, requiring a reset from the touch thermostat or heater controller board. Sometimes the heater would achieve a onging burn for a long period, and other times just locking out after 3 tries.

Careful observation of the flame, through the observation holes after it lit, showed correct flame sensing but as soon as the nominal 65C duct temperature was reached the combustion fan (modulates) throttles back too far and the flame goes out, the flame sensor switches off and gas valve is then closed. The pressure differential across the burner manafold controls the Gas flow rate so if the combustion fan goes too slow the flame goes out due to lack of gas.

On the control board there is a potentiometer marked "MIN GAS RATE" this needs to be tweaked clockwise until the burner remains lit when the nominal 60-65C duct temperature is reached. Don't turn it up too far or the heater may not throttle back enough and end up going out on overheat.

Once a stable flame is achieved when throttled, try the heater in the economy mode which uses a lower recirculating fan speed and check the flame still remains lit. My problem was most obvious in the Econ mode.

Hope this helps someone else - It took me over a year to solve this one. NeilP

Aug 21, 2011 | Heating & Cooling

1 Answer

Payne AC not working. 1. Thermostat set 68 to AC w/fan on. 2. Breakers and switch near heater are on. 3. Outside unit has 220v but is not running. 4. Fan in heater/Ac unit is not running 5. ...


Dan is this a new system, or has some work on the system (to include the thermostat) been done recently?

Sounds like the thermostat may be wired wrong. From what you describe, the igniter element is coming on, as though you are calling for heating. Do you allow the ignitor to keep going and see if the gas fires off, or are you seeing this and shutting down the system immediately?

If you had the t-stat changed recently, or this is a new system, contact the installing contractor. It may be under warranty.

Sep 03, 2010 | Carrier Heating & Cooling

2 Answers

I have a new home 1 yr and when the furnace kicks in, I am assuming the fan it makes a noise but as soon as the heat starts the noise is gone, could this be the furnace blower


Check by turning the unit off and turn the fan to on. Do you hear the noise now? The noise your hearing could be coming from your combustion fan assembly instead. Newer furnaces have a in-shot burner and are nosier than the old style of heater.

Jan 04, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

When very cold my furnace does not turn on warmer only sometimes


It sounds as though your thermostat isn't reading the temp correctly anymore. Its the only thing that tells the unit to come on and it may be short cycling because of the tstat. When the unit first comes on, its going to push the cold air out of the ducts first before the warm air and this is normal. I would replace the thermostat first because it is the cheapest part of the unit and wouldn't hurt since it is 13 years old. You will find that a new thermostat will be more accurate anyway and tend to save you some $$ on your electric bill. I hope this helps.

Apr 02, 2009 | Carrier 38CKC042 Air Conditioner

1 Answer

Carrier Heater less than 5 years old--shutdown


sounds like the igniter is not glowing to start the flame let me know if this helps

Jan 11, 2009 | Carrier 38CKC036 Air Conditioner

1 Answer

Home Heater / thermostat isn't working


It is possible that it may happen again. I reccomend having the burners and burner compartment cleaned, including the Heat exchanger.

If you dont, mind, please rate this solution. All the others were clarificatin requests so we could be sure we found the problem. Now that we found it, It would be great if you could rate the service.

Dec 30, 2008 | Heating & Cooling

1 Answer

Weather King 8PJ10NDR01 When I turn the heater switch to ON position the furnace runs what sounds like an internal fan. Second, the igniter glows and when it reaches it's hottest stage the fan thrusts air...


The gas valve is not sensing flame, and the unit shuts down on safety.

Chances are the flame sensor is bad, its a common problem.

If its a thermocouple you can buy one for 10 bucks, If its a newer style they can usually be had for less than 30.

They are easy to replace ad they are usually installed with two screws and one to two wires.

They sit directly in the flame pattern in front of the burners.

A service call should only cost you 250 or less for the repair, but you can do it yourself for less than 50 (including gas to drive to the HVAC supply house that sells your brand unit.)

You will need the model and serial #s when locating the parts.

Dec 27, 2008 | Weather King 12AJA4801AH Air Conditioner

1 Answer

Burners wont ignite


does unit have thermo-cupling

Nov 23, 2008 | Carrier 52PQ307 Wall/Window Air...

2 Answers

Heater not going on


Please send back the model number. Then we can narrow the roblem down.

Thx,
Peanut
RepairUSA

Jan 07, 2008 | Carrier XHB123D X/Y Series Heat/Cool Air...

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