Question about Carrier 38CKC036 Air Conditioner

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Condesor pump and fan

My fan motor just humms and my compressor just clicks does it sound like the capacitor the blower in the furnace stays running

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Yes dual feed capacitor in the condensor sounds bad. common to one side and outlet to compressor on the other and outlet to the fan on the third set of terminals. it should test bad but look carefully at it, it may be bloated up like a dead fish and easy to observe if you look at it closely. if bloated bad, worth a try anyway, cheap part ,usually under 40 bucks for most. label wires and reoplace wire for wire exactly with exact voltage and mf ratings. usually a motor shop has em. good luck.

Posted on Dec 07, 2008

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I will give you my best suggestions based on the information that was provided. It sounds like the blower motor is trying to come on several times unsuccessfully and then the flame is shutting off. If this is the case, here are my best guesses.
  1. If the blower motor has a run capacitor, the capacitor could be bad and the motor is trying to start but is pulling too many amps and tripping out on the internal thermal overload. You will need a multimeter that is capable of checking microfareds to determine if the capacitor is bad. Capacitors are usually marked....you will commonly see a marking of 5uf, 7.5uf, 10uf, etc... Sometimes all you need is a new capacitor. These are not very expensive.
  2. The blower motor itself may be bad.
  3. If there is a fan switch, it could be bad. A fan switch has a set of contacts that are normally open that will close when the switch heats up and send voltage to the blower motor. These will eventually wear out and act erratically if at all.
  4. The motor may not be getting the proper voltage, this too can cause the motor to pull too many amps.
  5. The most likely reason the flame is shutting off after the blower fails to come on is because the furnace is tripping on the high limit switch. This switch typically cuts the 24 volt power to the gas valve.
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