Question about Carrier 38CKC042 Air Conditioner

2 Answers

Carrier Condensing Unit clicks in HEAT mode / defrost problem

Hello. I have a Carrier "heat pump style" A/C. (Not sure of the exact model at this second because I am working on the base at the moment.)
The unit came with the house that we bought back in 2001. I got back from Iraq near the end of the winter season last year and noticed that my condensing unit was making a repetetive clicking noise. My wife and I live in eastern NC, so the temperatures seldom drop too much below freezing.
In the Cooling mode, the condensing unit does NOT click, so I did not realize the problem still existed until recently. The unit makes a continuous "clicking" noise, about every 2 seconds while running in heat mode. The unit continues to heat our house, and eventually the clicking stops (after 1-2 hours). Lately the unit has been freezing up. Mostly when it gets really cold outside. I know that a low coolent level will cause this, but early this spring I had the unit serviced with coolent and they did a complete check for leaks in the system. The serviceman found a leak and repaired it, charged the system and then charged me and arm and half a leg.
I do NOT think it is a low coolent problem, however could be wrong. When we first turn on the unit, it runs fine and will go into the defrost mode like it was designed to do. Steam does in fact defrost the entire unit. However, the unit stops defrosting after a couple of cycles and it freezes up again.
Could this be a thermostat or thermister problem? I do not want to let this keep happening and end up overheating or frying the condensor unit.
Obviously I do not have the money at this time to call another repairman, or he would have already been here to fix. I hate calling a repairman to fix something, charge me $75 just to pull into my driveway, look at what is broken, and tell me it was something I could have fixed myself.
I have gotten a lot of help from this site in the past with other issues, and have gotten great responses that have worked.. but most importantly.. worked the FIRST time.
Please help. Thanks in advance.

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  • backyardmech Dec 03, 2008

    My Model # is 38YCA030370 (Heat Pump) I am ordering a thermostat online today from Shorty's HVAC supply. They have the lowest price and the gentleman I spoke with at their company was extremely helpful. I thank you for your help on this matter and I will definately let you know if this fixes the problem. I do not have the money for the Carrier Heat Pump Defrost Board at this time, so I hoping that the thermostat fixes the problem. Thanks so much. You must be a retired/former Marine judging from your Iwo Jima picture. Mutch appreciated!



    Jim

  • backyardmech Dec 04, 2008

    Me too 86-90, out for 5 years and now 95-current. I will definately rate your solution. I am almost certain it will work when I receive my part, but want to make sure it does, and that there is no additional steps to add before I rate it though. Thanks again!

  • Gradywhite Jan 07, 2009

    I have theidentical problem...and the same model number of Carrier.. I wonder if this is a systemic problem, since I noticed you can buy a more expensice upgraded control board than the original..about twice the cost ..

    Did the thermostat fix your problem?? thanks C.A.

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There is a circuit board with a built in defrost timer in it the timer is bad change board

Posted on Dec 12, 2008

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Replace the thermostat on your Heat pump, get the model number and search the net for a distributer. If that doesn't fix it, you'll have to call another serv tech, it could be that your defrost board is acting up.. Let me know for my info also, I'm curious as to what they find. Also, being a Contractor, I don't charge just to come out, I usually diagnose then tell the homeowner. Find a Contractor that will do this for you, if it's simple to fix yourself, he should only charge you partial serv call..

Posted on Dec 03, 2008

  • Armando Bernal Dec 04, 2008

    Yes I was a Marine, 99-03, currently with the Army National Guard. Don't forget to rate my solution, I would really appreciate it.. Talk with you later..

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