Question about Samsung AS18A6RB Air Conditioner

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I have 2 samsung split a/c units in a room. I have the condenser with 2 compressors on the roof. It has one circuit board. One of the compressors works and the other does not. When I turn on the room unit that is attached to that compressor, the unit in the room starts and in about 10 to 15 seconds it shuts off and then a red light flashes. What would the problem be?

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  • ftmtechservi Sep 29, 2010

    Thanks for your response. The compressor does not turn on at all. The unit is not overloading. The evaporator inside is the one that turns on for a few seconds and turns off and then it shows a red flashing light.

  • ftmtechservi Sep 29, 2010

    The compressor does not turn on. The unit inside the room turns on and shuts off within seconds. Then the light starts flashing red.

  • ftmtechservi Sep 30, 2010

    Hi and thanks for your response. I wanted to give you some more information to make sure I narrow the problem down. The unit is a Samsung multi split system heat pump model ad18b1c09. There are two falshing lights on the inside unit, One is green and one is orange. This is the unit that turns off after a few seconds. Any thoughts? Thank you in advance.



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The compressor provides the cooling capacity for the air conditioner. If the compressor or its electrical controls are defective the compressor may try to start, fail, and create an electrical overload. If the unit does create an overload, every compressor circuit is also equipped with an overload safety switch. The safety switch is designed to protect the compressor from burning out. The safety switch will cut the power to the compressor for a certain length of time and then reset itself. When it resets it will allow the electricity to flow to the compressor once again. If the compressor then starts, the unit should function normally. If the compressor doesn't start when the overload resets, the overload will again cut the electricity to the compressor. This cycle will continue indefinitely. (Always allow three to five minutes before restarting the compressor.)
If this problem if not addressed on time, is often fatal to the air conditioner because the cost of repair often exceeds the price of a new air conditioner.
If this situation is occurring, unplug the air conditioner and get help from a qualified repair technician.
On the other hand, If you have some electrical knowledge and are not afraid of working with 220v, let me know and we can do some testing. You'll need a voltmeter and some basic tools. Good luck!!

Posted on Sep 29, 2010

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  • Rene J Solis Sep 29, 2010

    Ok, that changes everything. let me get you more info.

  • Rene J Solis Sep 29, 2010


    We need to know if when you turn on your unit, the compressor starts up. Have someone turn the unit inside while you check outside, if the compressor starts and then shuts down, or, if the compressor doesn't even try to start at all, then, replace/fix the PCB (circuit board). If he compressor tries to start and it can't, then replace the compressor's starting capacitor.

    Turn breaker to off position,


    gain access to capacitor and use a screw driver to touch the capacitor terminals, this is to discharge the capacitor. take a picture or label electrical connections. disconnect wires from capacitor and remove it.


    1 Open the front grille by lifting the tabs on the lower right and left sides of

    the indoor unit.

    2 Disassemble the front grille by pulling it forwards.

    3 Hold the edge of the air filter under the front grille and pull to release them.

    4 Remove screw fastening the plastic cover to the left of the unit

    5 Take a picture and label wires and plugs on the PCB before disconnect.

    6 Remove PCB

    If you are electricity savvy, no need to be an expert, on the circuit card there is a 1.2uf or 1.5uf (CBB61) that probably has gone bad, replace it yourself and save, the component is only a couple of bucks. Or buy the whole PCB. Good luck. Keep me posted.

  • Rene J Solis Sep 30, 2010

    That's exactly what I figure the problem to be. The solution is just for that problem. Good Luck!!



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