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Re: a/c unit not working
So only fan is running, the compressor not running okay check the voltage going to the compressor. The connection is coming from Thermostat or temperature controller, if there is supply going to A/c Comp. check the safety thermostat relay above the compressor.
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If you are talking about the top fan of your outside condensing unit, it could be several things. The fan motor could have failed, the run capacitor could have failed, or the motor is not getting power. Most units have a contactor that turns on the fan and compressor at the same time. If you only have one contactor, the fan motor or capacitor has failed. If you are good with a meter, check to see if you have voltage on the fan leads AFTER the contactor. If you do, I would recommend replacing the fan motor and capacitor
press the contactor in using a wooden pencil does it come on? if so then you are not getting a control signal from the tstat or a low pressure (low freon switch) is open stopping the contactor from pulling in
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.
I would start by inspecting the contactor make sure you are getting full voltage thru it to your fan and compressor. Usually there is a capacitor for the fan and one for the compressor. Make sure they are getting proper power and that capacitors are good. check amp draw and go from there,
you will need to check to see if fan leads(black and white) are getting there voltage at the top of the contactor. it should have a 5mfd capacitor to the left of the contactor make sure both leads are hooked to it. More then likely the motor needs to be replaced and if it does then all the information is on the motor(HP,RPM,Voltage,etc). The capacitor can be bad but you will need a multimeter that checks mfds. If you have to replace the motor then it is a good ideal to replace the capacitor,also. Good Luck Tim
Check the circuit breakers or fuses first. I'm assuming that the inside unit is running. If the unit has power, remove the small cover where the power goes in so that you can see the contactor. Next set the thermostat to make the unit come on and check the contactor to make sure that is has been pulled in and check for power on the load side of the contactor. If that is good then check the capacitor. If it looks swollen then it is bad otherwise check it with a multimeter or get a heating and air supply store to check it. If the contactor isn't pulled in, remove the face from your thermostat and place a jumper wire between R and Y. If the contactor pulls in then, the problem is your thermostat. If it doesn't the problem may be your contactor. Let me know what you find.
Is the fan in the outdoor unit coming on? If it is, that narrows the problem to just the compressor or capacitor. If neither is running, check the disconnect or circuit breaker or fuses that are located close to the outside unit. If the unit has power, remove the cover where the power goes into the outside unit, set the thermostat to make the unit come on and see if the contactor is pulled in. If it is, use a meter to check for power on the load side of the contactor. If the fan is running, check the capacitor for the compressor. Most units use one that works both the fan and the compressor. If the capacitor looks swollen then it is bad, otherwise use a multimeter with the capacitor check function to test it. If the capacitor is good, check the compressor motor windings with the multimeter on the resistance function. Let me know what you find and I can give you more advice if this doesn't get you going.
Did you check if the outside fan is working?? On the summer time the failure of condenser fan motors increases due to hi temps.
Have somebody turn unit on as usual while outside you check if condenser fan is turning and if the compressor kicks in. If the fan motor do not work, the compressor will shut of to prevent damage..
If either one of them tries to start but can't take off, replace starting capacitor, some units have separate capacitors and some have combo capacitors, they work the same.
If after replacing the capacitor the fan motor still don't want to start up, replace motor. If Compressor do not want to start, call a HVAC Technician to perform further testing.
Good Day!! Don't forget to rate this post!!
Fan motor is going out or the capacitor to the fan is bad I suggest replacement of both the fan motor and the capacitor which should always be done any time you replace the motor. Also check your wiring again you have a wire connected to the fan that is feeding voltege straight through to the motor. Your motor should have 1 black wire that goes to on side of the contactor 2nd wire should be white and it should go to the common side of the contactor (oppisite of the black) there should be 2 brown wires both of these should go to the capacitor. One of the brown wires may have a stripe on it if so it goes to the side of the capacitor that is marked if no stripe then it does't matter which side of the capacitor it connects to. Also check the contactor to see that the following hook up is proper. First the contactor has L-1 L-2 marking These are the voltage leads into the system from the power supply. Each side L-1 and L-2 should have 110 to 120 volts on each. Second on the top of the contactor there should be T-1 T-2 these are your terminal feeds the should feed the power to the unit and should have 110 to 120 volts respectivly. There should be 2 terminals at either side of the contactor that are your 24 volt feed from your transformer one connects to the left side of the contactor and one connects to the right side. This is the feed from the thermostat that signal the unit to come on. Good Luck on your repairs hope this helped you in some way