[griera]

Hi everyone. I have a Carrier furnace that is behaving erratically. It works during the day when the temperature is not too cold but it does not work at night when it is cold. I went to the attic to check it and I see the blinking led but I am not sure as to how to figure it out. The sequence seems to be short blink, long blink and immediately three short blinks.

 

[yuri]

There should be a sticker on the front or back of one of the doors with a legend with the code.

First digit is the short blinks and the second digit is the long blinks.

Post the model # of the furnace.

Look in : view yuri's album under my avatar pic and I have a basic Carrier legend in there with some codes.

 

[griera]

Here is a link to a video of the blinking led.

The model number is CK5BXT04.

 

[roughneck]

Should be a code schematic listed on the furnace.
Need the model number for the furnace. That one is the evaporator model.

 

[yuri]

That is a code 14 meaning ignition lockout.

I would start by cleaning your flame sensor. It should look similar to the one in this video.

Use clean steel wool or #400 emory paper. A dollar bill may not have enough grit in it but can do in a pinch.

 

[griera]

Yes there is a sticker showing the codes but I am confused as it states that the first digit is determined by the short blinks and second digit by long blinks but I get one short, one long and three short blinks again which is confusing.
The model number I provided is the only sticker with a model number I can find. I'll check again and will post it.

 

[roughneck]

Model number will be in the burner compartment

 

[griera]

I cleaned the flame sensor as suggested. The furnace is working for now but will see how it behaves at night.

Thanks for your help.