20 Most Recent Carrier 52PQ307 Wall/Window Air Conditioner Questions & Answers

Yes, if the filters are clean, the coils are clean, and it is still freezing up in cooling mode, then it is low on refridgerant.

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From the manual.
Message on the display(electronic models) E4 1. Failure in the inside temperature sensor E5 2. Failure in the outside temperature sensor FL 3. Dirty filter
To fix vaccume  (or wash your filter) then  hold down "Select"(or "Mode") and "-" (or "^") for 3 secconds.

While AC is ON, press the MODE and Arrow Down button simultaneously for 5 to 10 sec until "FL" message disappear and room temp is indicated.

www.carrier.com/homecomfort/en/us/for-owners

there is not enough refrigerant on your a/c

Pls note the heat temp that you kept must be 3 to 4 degrees C* between room temp and required temp.And also number-wise keep down will be high cooling and keep up will be high heating.Tnx

http://www.residential.carrier.com/support/troubleshooting.shtml
Here is some troubleshooting tips.
Also service available.

You can check the cause of that smell if you have the tools to open the unit. The first test is to place a piece of paper in front of the evaporator and start the fan. If the paper is **** or stays in front of the evaporator, you have a clean evaporator. If it is not ****, you need to open and clean the unit. The blower may be filled with dust and molds. It is best to find someone who knows how to work and clean your a/c unit

If you are in a high humid area, there will be a lot of water taken out of the air so you want to exhaust to the outside. If you are in a lower humidity area, then shut would be the better option, but it should work in either position, but if you get water dripping out then you might want to change the setting.

The compressor is hermetically sealed. They have overload protection for temperature but it is not manually resettable. Check for proper voltage at the contactor going to the compressor.

Transmission problem between remote and PCB sensor. Please replace batteries in your remote and try. If not try with another same type remote. If still problem persists, problem with receiving sensor in PCB. Repair or replace it.

If it's logistic thermostat don't keep in maximum. Keep in 11th hr position.If remote control, check your room sensor in front of the coil, may be defective-Replace it.

Hi, If there is no power in switch board you need to observe upstream line of power including your switch board, cables, circuit breaker supplying your air conditioner. You may find poor connection, defective switch / breaker. This task can be easy by using voltage meter and test pen. Regards,