Carrier 38ycc024 help please


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Old 08-27-19, 03:23 PM
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Carrier 38ycc024 help please

I am trying to troubleshoot my outside unit. It is a carrier 38ycc024340, I have found that the fan and compressor will not come on. However if the contractor is manually engaged they both operate until it is let off. I have checked for 24v coming into the unit but do not have it at the contactor. Not sure what to do from here. Thanks for any help.
 
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Old 08-27-19, 04:43 PM
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Welcome to the forums.

Check for 24vAC where the thermostat wiring from inside connects to the condenser. Typically it would be two wires in wirenutted splices. If you have power there..... you are either low on refrigerant or you may have a possible time delay board problem.
 
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Old 08-27-19, 06:16 PM
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Thanks PJmax, I do have 24vAC coming in from the therm wires all the way to the board. The 24v is not coming out the other side to the contactor. Is there a way to check the board? I will have to call a tech to check the refrigerant.
 
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Old 08-27-19, 06:33 PM
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Hi, so you have 24VAC inside going to the cable that is going to the outside, correct? Do you have a broken wire going outside, is this a Heat Pump?
PS itís not a good idea to force the contactor closed even for testing.
Geo
 
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Old 08-27-19, 07:25 PM
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Does this unit have pressure switches?
 
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Old 08-27-19, 07:38 PM
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Ok.... you have a heat pump and that's the defrost control board. In the diagram below for your unit..... it shows three possible sensors in the yellow/contactor line. It shows low pressure, high pressure and a discharge temperature sensor. You could have one or all three in your unit.

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Old 08-28-19, 05:42 AM
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Hi, next step, at that control board with the thermostat calling for cooling test between C - Y and if there is 24 VAC there go from C to the Low Pressure switch and continue on through out the circuit until you get to the contactor.
Geo
 
 

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