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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.

Sep 23, 2011 | Carrier 50TJ028 Rooftop Electric Cool Air...

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Compressor just stopped working, does not cyle on for cooling


1. Is there high voltage(240 volts) power to the condensing unit?
2. Is there low voltage(24 volts) to the contactor?
3. Is the contactor pulled in and allowing 240 volt power thru?
4. Does the capacitor look burned or misshapen, is the top of the capacitor domed up?
If so the capacitor is bad and needs replacing.
If you have all the above items and the capacitor is good(the condensor fan should be running) and the compressor is still not running, then you need a professional to diagnose why the compressor is not running.

Sep 02, 2011 | Carrier 38CKC036 Air Conditioner

1 Answer

Indoor fan contactor pulls in but both compressor and condenser fan contactors wont pull in ?


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

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


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




Apr 27, 2010 | Carrier 38CKC024 Air Conditioner

1 Answer

Central air system blows cool air not cold and


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.

Aug 09, 2009 | Carrier Heating & Cooling

1 Answer

Buzzer noise from carrier A/C condencing unit.


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

May 18, 2009 | Carrier 38CKC042 Air Conditioner

2 Answers

Carrier home ac system


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.

Aug 12, 2008 | Carrier Heating & Cooling

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?


A burned or pitted contactor will/can cause a unit to not run. Outside fan. Just thinking out loud. Start with low voltage check at t.stat then check outside low volt. Set t.stat to on. If fan engages at least your transformer is good. Next set calling for cool. Drop t.stat 68-70. If nothing happens go outside and with a screwdriver depress the contactor in. If fan and compressor kicks in change the contactor. If contactor is pulled in check outside fan. Remove the wires from the compressor and see if the fan will run . If it does you have eliminated start components as good. The compressor has to be check. It needs to be ohmed out. Turn off power at disconnect. Pull the cover on the compressor. Check between pins; then pins to ground. Open or infinite is good.Have you checked fuses. Like small 3-5 amp fuses

Jul 03, 2008 | Carrier Heating & Cooling

2 Answers

Outside unit will not operate


Sounds like a bad fan motor. Inside fan runs, compressor runs. Outside fan. Are your contactors pulled in when thermostat set on cool? If not might be a contactor. If contactor not pulled in touch the top of it with the end of a screwdriver. If fan spins turn unit off a buy a contactor...

Tip: Always make sure power at disconnect is off

Jun 10, 2008 | Carrier 38CKC042 Air Conditioner

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