Question about Carrier 38CKC036 Air Conditioner

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Gas heater won't work

Gas heater cut on, ignited, shut back off. Tried a few more times. Tech came and cleaned flame sensor. Worked fine for 2 days.Today blower turns on, not even a glow to ignite burners. Tech came and changes the glow ignition. Now doing it again. Red led light blinks short, long,long. It is a Carrier brand about 11years old.

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  • zajam Jan 05, 2009

    Thanks for looking at my problem. After resetting it, it finally is doing ok. It is extremely sensitive. If it gets turned on and off too much it just shuts down. We also changed to a digital thermostat because if I moved the lever too fast on the old kind it would shut down. It's hot here now anyway. Louisiana winters are lovely. Been running the a/c for over a week.

  • Keith Miller
    Keith Miller May 11, 2010

    is there a code explanation on the panel

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  • Master
  • 2,976 Answers

Which flame sensor did he replace? The pilot flame or the plenum temp. sensor.

Posted on Aug 10, 2009

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My adp cuhn-60a-2 sparks an lights burner ok, burns for only few seconds an shuts down burner, repeats this three times an whole unit shuts down?


You are describing the typical issue for a problem in the 'flame rectification' circuit. Turn the powere off. Find the flame sensor, it will be on the opposite side of the furnace from the spark ignition device. Carefully remove the sensor and clean with fine sandpaper, then clean the wire connector on the end of it if so equipped, then follow that wire all the way to the circuit board, remove the wire connection and clean it and reinstall. Many times that solves the issue.

Some systems utilize the spark ignition electrode as its own flame sensor. IF there is no separate flame sensor, perform the above task on the ignition device instead. Be careful NOT to bend the probe, crack the ceramic insulator or reinstall it malaligned. Its location in the pilot flame is critical. Slight relocation by improper handling will render it unable to ignite the pilot gas.

There may be another issue as there are many things that cause ignition lockout, but this is the first thing to do to eliminate the situation you've described.

If you are unsure of performing this and ANY minor maintenance to a gas fired appliance, abandon the idea and call a qualified service tech to proceed.

Dec 29, 2014 | Heating & Cooling

2 Answers

My one year old Day and Night heater is throwing a diagnostic code 6 -- flashing 6 times, meaning it doesn't sense the gas(?). Gas is on. Can I reset this myself?


How could it sense gas? What it probably means is it does not sense gas ignition. These new fangled furnaces rely on electronic ignition. The only probo is a built in safety system which verify s ignition has occurred. This is critical. The system must confirm their is flame from monitoring resistance in a flame sensing probe and that verifies Houston we have ignition!. Ok what I believe might be happening with your furnace is the sensor is contaminated with a buildup o it which won't readily allow enough noticeable change in resistance for the control to recognize if the gas is lit. We would not want raw gas going into the house would we? So I would remove the flame sensor and clean the residue off it and retry like in this video

Mar 24, 2011 | Heating & Cooling

1 Answer

Unit seems to ignite then cuts out, then blower comes on. Sometimes goes through that sequence and then no blower, does that 2-3 times then light on thermostat saying heater is on stays on but unit does...


If this has an igniter could be flame sensor. Flame sensor tells gas valve that flame is present or it will kick out. Flame sensor should be small rod connected to one wire, and it is on the flame somewhere sometimes opposite end from igniter If you do have sensor turn power off remove sensor and clean If white film on it. I usually clean it with dollar bill

Jan 21, 2011 | Heating & Cooling

1 Answer

I have a newer tappan heater and get 4 blinks on led for error code the unit starts up fine and has flame but flame goes off when blower kicks on


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution: You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

Nov 26, 2010 | Heating & Cooling

1 Answer

Our rheem gas pack running on propane will turn not always ignite


have you cleaned the flame sensor located on the
far left side of the burners?. Watch it go through the
cycles.

Igniter glows, gas valve turns on and gas ignites. If it gets that far and shuts down, it sounds like a dirty
flame sensor,clean it with sand paper.

Jan 10, 2010 | Heating & Cooling

2 Answers

Gas furnace, main burner ignites the other 2 don't. then shutdn.


Between the burners is a small rail in the pressed steel where the flame runs across to light the other burners and it sounds like there is dirt or debris in the step over rails causing the problem. You will need to use some compressed air on those rails to clear them out. Once the rails are clear the other two burners should ignite right away.

Dec 21, 2009 | Heating & Cooling

1 Answer

Goodman Heater kicks on but then it goes off as the burner is trying to ignite. Then come on and goes out after a few times 3 to 5 times, after awhile it will stay on... Then start all over again after it...


the gas furnace has a flame sensor when the flame kicks on and the flame sensor doesn't sense it it will shut off as a safety precaution and try three times to start again and then will lockout what you need to do is find the flame sensor it usually looks like a metal rod about 1'' -1 1/2'' long in a porcelain cylinder. it looks kind of like a mini screwdriver. You have to clean the metal rod with sandpaper or sandcloth the flame sensor actually conducts electricity with a flame cleaning them usually works make sure you check your connections especially ground.

Oct 30, 2009 | Goodman CLQ36AR49 Air Conditioner

1 Answer

I have a problem with my heating system. It is about 10 years old and has had the ignitor, combustion blower motor, and programable thermostat replace in it's lifetime. The system worked great last year....


sounds like its not proofing flame. it has a sensor usually like a needle sticks out into the flame that tells the gas valve the flame lit and is burning so its ok to keep sending gas, if its fails to proof flame then burner shuts down, then it tries to relight 3 times then locks out on fail safe. the blower will sometimes run continually once that occurs to highlight a failed condition. every time you reset it will try again 3 times then shut down. lp gas is very dangerous, even i do not work on it as the gas acts like gasoline and lays around. not like natural gas that disperses well. if you see the flame sensor try gently cleaning it with a little emory cloth. also a loose ground can cause this. check tio be sure any green wires are snug , they actually flow volts to ground through the flame on some to proof, thats why no ground no flame. if that fails then the board is most likely problem. change wire for wire , or get generic replacemant and follow directions exactly. good luck.some ignitors act as a flamre proofer as soon as they are done igniting! rarely do they fail to perform both funtions.

Nov 20, 2008 | Heating & Cooling

8 Answers

Carrier furnace weathermaker 8000


. Several times of recyling power normally brings the furnance up. Though the failure code has always been 31, there are several different behaviour when the blower starts after reset :
a. blower simply creases.
b. there is an attempt to start the heating unit (I hear the high pitch noises), then everything stops.
c. there is an attempt to start the heating unit (I hear the high pitch noises), once I see the orange glow from the coil, normally the gas is lit up and the unit starts working.

Nov 23, 2007 | Carrier XHB123D X/Y Series Heat/Cool Air...

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