Question about DeLonghi Pinguino PAC-77E Air Conditioner

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My Delonghi K900 overheats after only an hour of use. It is so hot, I'm afraid it will start a fire. Also, it only cools the indoor air to match the temperature outside. I thought I was purchasing an air conditioner that would actually cool the air. 

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Hello, have you tried shortening the length of the exaust hose, portable air conditioners rapidly loose performance when the hose is long. The exaust hose needs to be as short as possible with the fewest possible bends. The overheating is usually caused by the unit struggling to push the heat away from it, this would also explain the less than satisfactory performance. Another thing worth checking is that the filter and the fins on both radiators are clean as dirt will decrease its ability to move heat. Hope this helps.

Posted on Aug 01, 2009


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Posted on Jan 02, 2017


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Look for:
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The ac needs the fan motor(s) working and compressor running and pumping. Compressor skinny copper line hot and thick line cold.

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There a several things that can cause the problem you have described.

1. The Dehumidifier Mode is operating at the same time as the AC or is operation on it's on.
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2. Air filter needs to be removed and cleaned.

3. A blockage or crimp in the exhaust hose.

4. The exhaust has a leak or has come loose from the unit.

5. The unit is sitting in direct sunlight or is adjacent to a heat producing appliance.

6. Compressor needs to be recharged with R134a refrigerant gas.

The 6 things listed above are where you need to start troubleshooting. 5 of which are easy to check and correct.

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