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Carrier 38tdb048300 no a/c

I have all the rite voltage to circuit board in a/c but no comunication lite and no a/c.infinity controler calls for cool and blower comes a/c

Posted by Anonymous on


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Posted on Jan 02, 2017


SOURCE: control circuit board for carrier a/c unit xcb 183e

We have a Carrier A/C, Model# 2397E15183 (INSIDE) about 12 hours ago (I believe it is a fan) started making a kind of grinding noise when it starts up and when it cycles off, this is located at the bottom portion of the unit. It is cooling well and the outside unit works fine.

Posted on Jul 15, 2008

  • 163 Answers

SOURCE: 3 amp fuse blows on a carrier 58mcb furnace board

Hi!!! Does your ac unit work fine?If not check your low voltage problem..You have a low voltage problem check the wire going out to your condensor make sure that they are not touching..Good luck..Check low voltage wires..short in progress..

Posted on Jan 04, 2009

  • 15 Answers

SOURCE: carrier infinity control SYSTXCCUID01-B sensor communication erro

There should be a little black sensor bulb outside either on the unit normally under the electrical panel or inside it. It sound like the wire has come off or been disconected. It needs that on to properly run. Your control is trying to communicate with the outdoor unit and can not.

Posted on Jul 08, 2009

  • 135 Answers

SOURCE: Carrier Low pressure lockout - 4 hours

If the low pressure sensor trips, the least likely problem is a bad sensor, more than likely, you have a leak in the system, this will require leak location, repair and recharged.
Also posible, a dirty air filter, plugged indoor coil, causing the indoor coil to ice up, causing a temporary low pressure issue, solution would be to clean the coils, power the system down and restart and test.
If this has been helpful, please rate the new guy :)
If you have any other questions, please give me a shout.
Paul Gibson

Posted on Apr 06, 2010

  • 415 Answers

SOURCE: blower motor does not respond?

First, Open the Blower Access panel door of your air handler and touch the motor to see if it is hot to the touch.
If it is hot to the touch, turn everything off of approximately 1 hour.
Then with the blower access panel door off, turn the FAN back on and listen for any sounds. If the motor does not start, try spinning the blower wheel with your cautious, because the motor could start up while you turn the wheel. If this happens, chances are good you have either a bad capacitor or bad bearings. To test the bearings, turn off all the power. Grab the end of the shaft and start trying to move it from side-to-side in every direction. Do not move it up-and-down. Up-and-down will not hurt anything, but it will not tell you anything either. If there is any movement side-to-side, the bearings are bad and the motor will need to be replaced. If you do not feel side-to-side movement, then there is a good chance it's the capacitor.....take to A/C supply house....they will test and offer you a replacement if it is needed.
If the motor is cold and it doesn't try to spin and it doesn't try to run on it's own after you spin it, then the problem is in the control circuit. Try putting a jumper at R & G. If the motor then runs, you have a problem with either your thermostat or the wiring from your thermostat to your Air Handler. If after jumpering R & G the motor does not try to run, then you may have a failed blower relay or a failed board (if the relay is internal in the board). Let me know if you need additional help. :-)

Posted on Apr 16, 2010

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3 Answers

I am replacing the thermostat with the Ecobee3 lite smart thermostat. The thermostat did not power up. My A/C unit is a Carrier model 40AQ030300BB. Might I have popped a fuse or something?

yes you likely blew the fuse. it is likely a blade style/ similar to one in a car, located on a circuit board inside the blower compartment. BE SURE TO TURN POWER OFF AND LOCATE AND REPLACE WITH SAME THING!!

Nov 11, 2017 | Carrier Heating & Cooling

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What to do with carrier infinity ac fault code 81

"Low capacity thermal lockout"#81. What this tells me is your 1st stage cooling(low capacity) is locked out for 4 he's due to a dirty outdoor coil, weak outdoor fan motor run capacitor, slow outdoor fan motor, overcharged with freon, restricted or short cycling outdoor airflow(overheating), damaged discharge temp switch, faulty outdoor circuit board. That's all the scenarios I can think of for now. Hope this helps!

Aug 24, 2017 | Carrier Heating & Cooling

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If your outdoor unit has a control board/circuit board, it will located at the outdoor units electrical panel where the line voltage electrical whip goes into the unit. Should be 2 screws that hold the panel/cover on. Turn off power, remove panel, and board should be visible.

Mar 30, 2017 | Carrier Heating & Cooling

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Infinity system. Why is the wall thermostat display blank?

Either an open control fuse at the circuit board, a fault at the circuit board, wiring to the tstat or fault at tstat.

Jul 09, 2015 | Carrier Heating & Cooling

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Zone control not working

These are both power open and closed. Yellow and green should be constant on the leds. C&D is your 24 volts for the controls. If you got power going in but nothing coming out of the board it is bad. If you got 24 going to the damper but damper not responding obviously it's bad. Usually communication is DC voltage, likely 12 or 13 DC at A&B. Good Luck!!

May 13, 2017 | Heating & Cooling

1 Answer

A Carrier mod # 24ANA760A300 Infinity with an error code #72 high stage thermal cutout, What causes this?

if it's a thermal cutout that's mounted on the circuit board you may have to replace the whole board. I don't have the carrier error codes at hand. But a "thermal cutout" is normally found on the compressor. One advantage of the old (before digital) systems is that the controls were all separate. So you could replace a bad high pressure switch or contactor. Without having to replace a expensive circuit board that held most of the controls.
Not to mention being easy to damage by power surges and lightning

Jul 11, 2012 | Carrier Heating & Cooling

1 Answer


Carrier Infinity systems, do not have a manual reset switch. It will have an automatic reset depending on the failure.
I would first, turn off the breaker to the indoor and outdoor units. Wait about 5 mins and turn the breakers back on. Doing this will reset the Control Board in the system. The system itself, is probably locked out.
This should get the system to come back on, However, you may have the problem come back and lock out the system again.
If this happens again, i would advise calling a Carrier dealer with Infinity systems to test it.

Hope this helps

Nov 28, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

At the test point on the circuit board there is no voltage on the other side of the gas valve relay. So the valve won't open. The switches all seem ok until it enters the microprocessor and then goes into...

If you positively have gas valve relay identified and it has power going in when thermostat is calling for heat but nothing coming out I would change the control board. Hope this helps. Thanks

Nov 18, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

5 Answers

Carrier Infinity Control Thermostat SYSTXCCUID01-B

Your old stat is wired for a traditional thermostat and not a communication stat like the new infinity you have. There is a module plug on the furnace board that will need to be connected to the new thermostat for it to work. The wires that are wired now are from a terminal strip inside the furnace. Please contact your local Carrier dealer. They may be able to get that harness for you

Dec 06, 2007 | Heating & Cooling

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