Question about Samsung AW0503B Air Conditioner

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I have a samsung silver nano...the indoor unit & the outdoor unit fans are running...but there is absolutely no cooling. Any idea why?

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  • Ensure Air Filter is clean - clean as necessary
  • Ensure Evaporator coil is clean - clean as necessary
  • Ensure Condensor coil is clean - clean as necessary
  • Inspect all wiring inside the unit for any loose or damaged connections - correct as necessary
There could be a failed compressor relay, run capacitor, or compressor motor/valves. Of course, it could also have lost it's refrigerant charge.

Without being onsite with toolbox in hand, I hope you find this information to be very helpful moving forward. :-)

Posted on May 10, 2010

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Posted on Jan 02, 2017

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Luxpro psd111 thermostat shows snowflake (sometimes blinks), outdoor fan works, but no cool air comes out inside- no air flow at all. Is it the thermostat or an a/c unit malfunction?


If the outdoor unit is running the indoor fan should definitely be running. Turn power off to indoor unit. Put red green and yellow wires together behind the tstat with a wire nut. That is power (red), indoor fan (green), and compressor (yellow.) Turn power back on. This is bypassing the tstat and you should have indoor fan and outside running as well. If yes the problem is in the tstat, if no indoor fan the problem is in the unit. Good Luck!! Let me know!!

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How to troubleshoot thermostat wiring?


I'm not sure if the thermostat is wired correctly. First, the thermostat is wired directly to the outdoor unit (compressor/condenser unit). It is NOT directly connected to the indoor unit. It connects to a low voltage control panel in the outdoor unit that sends a signal to your indoor fan/evaporator. This wire is called the fan relay switch and physically runs between the low voltage controls of the indoor and outdoor units. If the fan relay is bad it's possible that the unit runs continuously. To prevent destroying your outdoor unit there is a safety feature that prevents the indoor fan from shutting down while the outdoor unit is running. If the indoor fan did shut down while the outdoor unit was running than you would slug your compressor. That is, your compressor normally sees refrigerant gas but is instead seeing refrigerant liquid. That would not be good since this scenario would destroy your compressor. It sounds like a faulty fan relay. The actual contactor portion of the relay is in the outdoor unit.

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Front grill


Check the air filter and if it is dirty, replace..
Turn equipment off and let the ice melt.
After ice melts, place a/c in cooling mode and set the thermostat to 3 degrees below room temp display.

The indoor unit fan should start blowing cold air immediately and then turn off once the room temp drops one degree below the cooling temp setting.
If the indoor unit does cycle off, check the outdoor unit and make sure it turns off at the same time.
If the outdoor unit continues to run and the indoor fan is not running, the indoor unit will ice up.
A defective compressor relay that is stuck in a closed position will cause icing of the indoor unit because it keeps the compressor running when it should turn off with the indoor fan.

Do you have an error code being displayed on the controller?
Is there an led light that is flashing on the indoor unit?

Another possibility causing the indoor unit to ice up is if the freon in the system starts to get low.
Make sure the ice has all melted for this next check.
Pretty easy to check without special tools.
If the air filter is clean and there is no dust/ dirt blocking the fins on the indoor unit, turn a/c back on to cool and check that the indoor unit fan comes on and is blowing air good.
Once everything seems to running good go to the outdoor unit.
There will be two lines with black rubber insulation covering them.
Peel back the insulation three inches on each line and observe the copper lines.
If either line starts to frost up the a/c system is most likely low on refrigerant.


Another cause of indoor unit icing could be that the aluminum fins behind the air filter are clogged with dust or other foreign material.
This would block the air that must be pulled in causing the indoor unit coil to become too cold due to lack of air flow and it will ice up.

Operating the cooling system when the outdoor temperature is below 60 degrees can cause the indoor unit to ice up also.

I'm Robert.
Florida certified a/c contractor. 30 years experience.
Hope this helps.


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Possibly a bad control board in the outdoor unit. Pull the disconnect outside to stop machine, wait 10 seconds and out back in. White mist was likely frost built up on indoor coil due to condenser running without the fan.

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