I have model no. CB5AXA024000AAAA
I CAM HOME TO FIND THE FURNACE FAN RUNNING
CHECKED THE THERMASTAT AND IT WAS IN THE OFF POSITION
I KNOW THERE IS A PART THAT TELLS THE FAN TO RUN INDEPENDENT OF THE THERMASTAT AND I SUPECT IT IS THIS PART THAT IS DEFECTIVE BUT I HAVE NO CLUE WHAT IT LOOKS LIKE.
I AM A MECHANIC AND ADDAVANCED IN AUTOMOTIVE A/C AND I WOULD LIKE TO FIX IT MYSELF.
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Re: Carrier home heat
If the unit is manual control there are two knobs in the control the thermostat and the selector switch. If your selector switch is in fan position the fan will run and the compressor will be "off"(even if you "off" and "on" your thermostat), if your selector switch is in cool position and your thermostat is in "on" position the compressor and fan will both run. But if the thermostat is in "off" position and your selector knob is in cool position the fan will run but the compressor will be "off".
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That means that the furnace is throwing a code to trouble shoot whats wrong. Most of the time, furnaces will have a code list on the inside of the door cover to explain what each code means, some of them don't. Its hard to say what it could be without knowing where to start. However, answering a few questions with someone knowledgeable over the phone if possible could help speed things up, but it would involve you being at the furnace and seeing what happens before it throws the code. If you do have a code list, this would help tremendously.
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.
Change the furnace filter. Make sure you use a cheap one when air conditioning, as the better ones restrict airflow when they filter out so much stuff and then plug up, not allowing enough air to pass over the cooling coil in the furnace's air plenum. Turn the A/C off for a few hours (with only the furnace fan on if possible) to melt the ice off the cooling unit inside the furnace.
GOto the iside unit itself. and remove the door and look for a terminial strip that the thermostat wires from the thermostat connects to and write down the colors wires and the letters they're connected to and connect the same to the thermostat .... they should be... r--red=power w-white=heat y--yellow=cool g-- green=fan! See which wires/ colors they're not using and bend back! Thank-you-very-much!
If your are talking about a combustion motor, not the actual blower that blows into the home, it is not satisfying your controls going back to the board. There is a vacuum module that has to satisfy first. If all that is satisfied, you may have a bad ignitor. Do not touch the ignitor part of a new one with your fingers.
Is this a package unit??? Or is it inside the home?? How old is the furnace. The first thing to do is axcess the fan and see if it is controlled by a computer or its old enough to have a fan switch. Trace the red wire from the fan mtr that should take you to the fan switch