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Contactor not pulling in on cooling for carrier pack unit

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If the T-stat is on cooling take a volt meter and touch one lead to each side of the low voltage termanals on the contactor and if you have 24 volts the contactor is bad, if not start back tracking

Posted on Nov 01, 2008


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The outside fan in my carrier unit will not stop running when temp inside has been reached?

There can be multiple problems with your situation, one being a stuck condenser fan motor contactor/relay, a shorted motor, bad control board, etc. If you could at least check the contactor that controls the CFM and see if it is pulled in that could help narrow down the search for the answer.

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1. Is there high voltage(240 volts) power to the condensing unit?
2. Is there low voltage(24 volts) to the contactor?
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4. Does the capacitor look burned or misshapen, is the top of the capacitor domed up?
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You either have a problem with the wiring/fuses/ breakers/worn contactor. If someone goes inside and sets the stat to cooling you outside should hear a click and maybe a small hum. If this is what you find the power feeding the condensor is tripped or fuses are blown.

Apr 25, 2011 | Carrier Heating & Cooling

1 Answer

Condenser Fan and Compressor not turning on.

Are you sure you have high voltage going to the unit? One wire from fan lands on top left of contactor, the other two go to C and Fan on capacitor. Manually push in contactor, if no fan than no high voltage.

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I have a Carrier 38CKB048 and it runs without shutting off.

99.9% probability that your contactor is stuck/sticking. Replace the contactor.

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your indoor unit is only circulating the air in the house. for your condensing unit. check your breaker in the electric panel. your contactor or your capacitor.

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1 Answer

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Sounds like the contactor is bad.It has a magnate that pulls in with a call for cooling,It will buzz like crazy sometimes.

Jul 13, 2009 | Carrier Heating & Cooling

1 Answer

Outside carrier unit doesn't come on when thermestat on cool

The board is bad, what you can do is splice into the common (blue) and Yellow t-stat wires and connect them directly into the contactor and hopefully the reversing valve engages, giving you cooling for the time being

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sounds like your contactor is stuck closed.This is the part that high voltage connects to and lets power through to the compressor and condenser fan motor when you get a call for cooling.If you go to pull it out,kill the power outside AND at the furnace.

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1 Answer

I have a carrier infinity system. On the thermostat it reads "sens error" where the outdoor temp is normally displayed. The inside unit is running but the outside unit is not. Any suggestions?

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