Welcome to Our Air Conditioner, Heat Pump Contactors Page!

Hello Everyone! We Hope All of You Have A Happy, Healthful & Prosperous 2010!

This page contains some of the contactors that I use to repair air conditioning and heat pump problems. I see these problems most often every summer in our 16 year HVAC business. Let us help you repair your air conditioner and save money! 

*Summer Air Conditioning Tip: Always turn your air conditioning system off if there is a threat of a storm. A lightning power surge, or if the power is goes off and on can ruin your air conditioning system. We get lots of repair calls after a storm. These calls could be prevented if people could remember to turn their air conditioners off during a storm.

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Please always, make sure all electrical power is turned off before attempting to do any heating or air conditioning repairs. Please read our disclaimer and "Safety First" related information near the bottom of this page. Thank You!

 Air Conditioning Contactors:

Problem: Air Conditioning outdoor condensing unit or heat pump unit will not shut off. It continues to run no matter what you do.  The only way you can get the outdoor unit to shut off is turn off the breaker or pull the outdoor disconnect. Also, sometimes when the contactor fails the outdoor condensing unit will not come on at all. Dirt or insects (I see ants many times) can get in between the contact points while the contactor is off, and cause the air conditioner not to come on at all.  When the contactor is stuck in the "On" position (contacts welded together), Ice will form on the indoor evaporator coil and all the way out to the outdoor unit. I have seen 1 or 2 inches of ice form on the line set and outdoor unit compressor. You will not get hardly any air flow through your duct work when this happens because the evaporator has become a complete block of ice.  If this is your problem then your contactor points could be stuck, welded together causing the outdoor unit to run continuously. Many times when ants or insects get between the contactor points the outdoor unit will run (burns the insect out), but because of the uneven wear (arcing) in the contact points the contactor will soon fail. Arcing causes a tremendous heat build up and pitting of the contact points. If you are in an area of the country where insects are prominent in and around air conditions, then I would suggest you blow your contactor out with compressed air or check and make sure you do not have any insects in between the contactor points at the beginning of each cooling season. You might want to keep a spare contactor on hand?

If your contactor looks like the single pole contactor below, with burnt or pitted contacts then you need a new contactor. The picture below is of a single pole contactor out of a Rheem air conditioner. The blue and yellow wires (near the bottom of the picture) are the low voltage wires that come from the thermostat. The red and black wires on the right side are the high voltage wires coming from the disconnect box. The four wires on the left side connect to the compressor and fan to make them come on when the contactor is energized by the low voltage wires (blue & yellow) coming from the thermostat.

Solution: You need to solve this problem by purchasing a new contactor. We sell them below.

Contactor's Purpose: The contactor has a 24 volt relay, when this 24 volt relay is energized from the thermostat, a call for cooling, the contacts on the contactor close, making a high voltage (220-240) connection to your compressor and outdoor fan, causing the outdoor unit to come on. There are several types of contactors that we sell. They are pictured below. *Please make sure your electrical power is off before attempting to remove or work on air conditioning equipment. Pull the outdoor disconnect or indoor breaker that controls the air conditioner. Turn the furnace off or thermostat off so no low voltage is going through the low voltage wiring.

Below are pictures of the contactors that I use in my HVAC business. I probably replace about 20 of these every summer. You will need to look at your contactor and see if they are similar to these:

If you are looking for Bryant, Carrier Contactors Please Click on the logo below.

Furnas, Single Pole 24 Volt Air Conditioner Contactor

Part # 45EG10AJA

The first contactor that we sell is a one pole 24 volt, 30 amp. contactor. When the contacts close the bottom "L1"  of this contactor makes high voltage connection, or contact with the top of the contactor "T1" and your air conditioner or heat pump comes on. I like this contactor because it has a cover for the contacts that keeps the dirt and insects out. This contactor has a place for 8 wires to connect at each end of the contactor. Below we have pictures with an opportunity for you to purchase.

Above Specs On Label of Contactor:

                         Top View                         Box Specifications:              With Cover Removed:

Furnas Single Pole 24 Volt Air Conditioner Contactor:

Part # 45EG10AJAL1

I really like this single pole contactor because it has the large screw lugs on each end for large wires and easy connections.  I also like this contactor because it has a cover for the contacts that keeps the dirt and insects out.  If you do not want to use the large screw lugs then they can be removed. This makes it easy to connect large wires. This contactor has a place for 8 wires to connect at each end of the contactor. Below we have pictures with an opportunity for you to purchase.

This new contactor part #CONT1P040024VS replaces Goodman Part Numbers #B1360321 & CONT1P025024V. I really like this single pole contactor because it has the large screw lugs on one end so you can easily connect wires. This makes it easy to connect large wires. I also like this contactor because it has a cover for the contacts that keeps the dirt and insects out. This contactor has a place for 8 wires to connect at each end of the contactor. Below we have pictures with an opportunity for you to purchase.

Siemens 45GG10AJA, 40 Amp Single Pole Contactor

If you have a larger air conditioner 4 to 5 tons and need a 40 amp single pole contactor then the Siemens 45GG10AJA would be a great choice. This contactor is a Trane, American Standard OEM part #CTR1152. This contactor has a place for 8 wires to connect at each end of the contactor. Below we have pictures with an opportunity for you to purchase.

Furnas, Double Pole 24 Volt Air Conditioner Contactor:  

Below, we sell the two pole 24 volt, 30 amp. contactor. I really like this contactor because it has a cover (picture on far left) that protects the contacts from getting bugs and dirt between the contacts. When both sides of this contactor close it makes a high voltage connection, or contact, and your air conditioner or heat pump comes on:

 Top View:        Top View if Cover were removed:      Box Specifications: 

Above Picture of 40 Amp. 2 Pole

Contactor Top View. 

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