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I have a goodman cental air that the compresser will not turn on unless you manually push in the contact on the 24 volt thermostat coil. I'm not sure how it's supposed work but i think there should be 24 volts out of one side of the coil to the thermostat and back. I don't have voltage on either side. Does this indicate a bad coil?

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  • 117 Answers

You need to check for 24V across the coil.


The thermostat is nothing more than a switch which closes the Y terminal to the R terminal and allowing the 24V to be fed from the transformer to the contactor coil and thus turning the system on.


Easiest was to check this would be to turn off your breakers and jump out the Red and Yellow terminals with either a jumper wire or wire the two tegether. If the contactor engages, you have a wiring problem. If the contactor fails to engage, your problem lies within the outdoor unit.


If you have a multimeter, check for 24V between the Y terminal and the Common terminal at the outdoor unit. If 24V is present, this is also an indication of a problem within the unit itself.


Remember, a lot of Goodman units have pressure switches that open and close according to pressures. You system may not be running for a whole other problem like a loss of refrigerant charge. And this is a good thing. It shuts the unit down to prevent further damage to the system.



Posted on Jul 04, 2010

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2 Answers

My Home AC blows hot air


You need to check to see if you have 24 volt signal from thermostat to your reversing valve. To go into cooling mode the reversing valve needs to be energized. Orange is normal color of the reversing valve power supply. On your unit will be a reversing valve which looks like a pipe with 3 pipes attached to one side and 1 pipe attached to the other side. On the side of the the reversing valve will be a coil with a 2 wire connection. This coil needs 24 volts applied to shift unit into cooling mode. In your thermostat wire bundle where it is connected, check for voltage between common and the orange wire. If it does not have 24 volts with the thermostat in cooling mode, you have a break in the line normally a connection on the orange junction inside your air handler or your thermostat orange wire is loose. Keep checking for 24 volts available until you find the source of the loss. If you have 24 volts at the reversing valve, you can check to see if the valve is working by unplugging the 2wire connection on the side of the valve, if it clicks its powered if not and 24 volts available then the coil needs replaced.
Any more than this you will need a professional tech to troubleshoot and fix.
Hope this helps.

Jun 21, 2014 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Why won't the compressor run


This can be for a variety of reasons. It ranges from something as simple as no supply power (blown fuse, open breaker, faulty contactor, or run capacitor) or it could be more serious as a grounded or open winding in the compressor motor. My suggestion to any novice and or person without proper tools and knowledge; First check the low voltage (24 volt control voltage) by turning on the "Fan on" switch located on the thermostat to on, not "Auto" The blower fan should come on, indicating there's 120 volt and 24 volt available. Fan doesn't come on is an indication that there's no control power. The next step would be to check for power at the transformer and fuse located in the air handler. There should be 240 volts feeding the transformer, and 24 volts coming out. The control voltage is needed to operate the thermostat (which is the switch that sends the 24 volt signal to the compressor contactor to turn the compressor on/off. This 24 volt also powers other relays and switches in the system. knowing that 24 volt is available also tells you that the problem is most likely in the condensing unit (outside, where the compressor is located). At the condensing unit you should check for 240 volt supply power. Upon finding 240 volt supply power the question now becomes whether or not the thermostat is calling for anything (cool or heat if the unit is a heat pump). There should be 24-30 volt available at the small gauge wires feeding the contactor coil. While having the thermostat set at a temperature lower than the current room temperature (in the cooling mode) the thermostat should send a 24 volt signal to close the compressor contactor and turn it on. The non-metallic end of a screwdriver can be used to depress the moveable part of the contactor. After pushing in the contactor, should the compressor start then you may only need a new contactor. It may just hum because of a faulty run capacitor or grounded or shorted internal motor windings (grounded or shorted windings are usually indicated by tripped circuit breaker and/or blown fuse). It's a good idea to have a good multi-meter and knowledge of use before attempting any repairs or diagnosis on your own. I recommend some basic knowledge of electricity before even thinking about attempting any repairs or diagnosis.

May 08, 2014 | Goodman Manufacturing Goodman GSC130421...

1 Answer

My air conditioner will not run, the fan will not run in auto or in run mode, the compressor will not start. The thermostat clicks on but the air unit does not. this is a Goodman cplj18-1b unit.


Hello, if the outside unit is not running check tje power supply to make sure you are getting 240 volts, also make sure the contactor coil is receiving 24 volts, if you are not getting 24 volts at the contactor then it may be a bad thermostat, control board or the thermostat wiring is loose or perhaps cut somwhere. If you have 24 volts at the contactor and does not energize than replace the contactor coil.

May 12, 2011 | Goodman Heating & Cooling

1 Answer

CONTACTOR IS NOT MAKING CONTACT WHEN THEMOSTAT IS TURN ON. I REPLACE THE CONTACTOR BUT THE UNIT STILL NO COMMING ON


Hello. Make sure you are getting 24 volts to the contactor coil, you can check by using a multimeter and put the probes of the multimeter to each side of the coil ( not the contacts) if you are not getting 24 volts than u must check the low voltage wiring to make sure there is no loose connection. also check the thermostat to make sure it is wired properly.

Feb 01, 2011 | Heating & Cooling

1 Answer

A/C compressor has power to the contactor (220) but will not kick


Check for 24 volts at your contactor coil. If you have 24 volts at your contactor coil, then you should read 220 volts on the other side of the contactor. If you do not read 220 on the other side, then the contactor is failed and needs replaced. If you do not read 24 volts at your contactor coil, then you have to find out where the "break" is. See if you have 24 volts at "common" and "Y" at your outdoor unit. If you do not, the problem is somewhere between your outdoor unit and thermostat. If you have 24 volts at your outdoor unit but not at your contactor, you have a problem somewhere inside your outdoor unit. Using this information, do some more investigating and let us know what you find, we will guide you further from that point. Good Luck! :-)

May 25, 2010 | Goodman CKL60AR60 Air Conditioner

1 Answer

My goodman cental heat & air unit quit working last night


check to i see if there power to condenser. check to see if there 24 volts to condenser.checkt the disconnect box for power located out side by the condeser you should have 220volts at that box. check to see if your stat is set on cool.

Jun 20, 2009 | Goodman Heating & Cooling

1 Answer

I have goodman 13 seer/ I have power going into the unit and it will not pull in the contact and when i push in the contact the fan will run but not blow in the house and both cooper pipes on the outside...


check power on the 24 volt coil of the contact pushing in the contactor will not make youre blower in the house run only start the compressor and condensing fan on the outside unit. if u do not have 24 volts on the coil of the contactor that could mean a few things high or low pressure switch is open. which this sounds like the problem because you stated the unit starts but both (copper) pipes stay warm this may be cause by no freon in the system. see normally if you push that contactor in when the indoor fan not running u will get really cold big pipe thats called the suction line. check if you have voltage on the coil when unit is calling for cooling if not look at the schematic and ohm the pressure switces if there are any

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1 Answer

Goodman SSX16 split system not working


Defective thermostat wire.
Defective contactor.
With the t-stat set for cool and turned down on a low temperature, check for 24 volts at the contactor low voltage hookup. If you have 24 volts, replace the contactor.
You can manually close the contactor to make sure the high voltage is going through it.

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1 Answer

Ruud Centall Air:power to A/C but will not turn on


does the unit have a pressure control?or time delay?

Mar 18, 2009 | Ruud Central System Air Conditioner

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