Question about Carrier 38CKC042 Air Conditioner

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Hi, I have a 1.5 carrier mini split heat pump. I cant find the model number but believe it was made 2000-2003. This has the remote with the infra red eye mounted in the front of the main unit (like a tv). (There is no other controller as I have seen with other units). The unit is heating and cooling fine, however, it does not seem to be sensing the thermostat. Whether it be in heat or cold, it will turn on and run for about 10 minutes and then shut off and not come again. To get it to run again, I shut off the power coming to the unit and then I hear a little "click" on the main unit. Then I turn back on the power and it will immediately begin cycling and run for another ten minutes. I am thinking that the "click" I am hearing is resetting something but I dont know what is going wrong..thanks

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  • rrreddd Mar 27, 2011

    Just what I needed to know. Thanks!

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  • Carrier Master
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Hi,
There are a few things that can cause that kind of problem....
The unit could be low on charge and the thermistor on the indoor unit will sense the coil getting too cold and shut it down on a hard lockout....resetting the power resets the lockout...
If the unit is low on charge you will need a tech. that can not only add more freon, but also check for the leak(s) and fix them also....
Now, that thermistor could also be bad and that is causing the lockout...
Also the outdoor fan may not be running and causing the unit to lockout...
Another thing to check is that the indoor air filter... make sure that it is cleaned regularly...low air flow will lockout the unit...

The reason the unit is working for 10 minutes is because the unit has a 10 minute override on these conditions that will keep it from shutting down till the 10 minute time period is up...

Feel free to comment back to me if you have any more questions...

heatman101

Posted on Mar 24, 2011

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Posted on Jan 02, 2017

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