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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.
Hello, a contactor is a switch/relay that turns on and off the power to the compressor and condenser fan motor. It is located in outdoor unit in the control panel. You can follow the wires leading into the outdoor unit and they lead to the contactor.
Hi, and no this buzzing is not normal. If the test button does not trip, its not to major. It sounds as though you have a relay, fan, compressor, or some other relay that has worn contacts that buzz when power is put to it. If the unit operates and its not to the point it is driving you insane, you can take it apart to locate which relay is the noise one and replace it if you have the skills to tackle it. If it fails completely, not knowing the sequence of operation unless you can read a ladder schematic, you will have problems locating the one that was buzzing. I would remove the front cover if its a wall or window unit to find the control section and locate this buzzing relay to replace it. Best of Luck to you, Shastalaker7
thats it? you may be hearing the contactor relay which is fed power from inside (24v). could be a bad fuse which was caused by a bad or going bad compressor. possibly one of the terminals on the compressor (probably start) has burned off and grounded on the compressor which blew the fuses. Get an electric meter and test the fuses and if they are good, inspect the compressor and see what the wires look like. If they are good disconnect them and write down where they go. test the ohms between each terminal and list them on this site ill tell ya if you have a good or bad compressor. also test ohms from the ground to each terminal and if you get 0 on any terminal to ground your compressor is dead for sure...
Is the thermostat knob turned to the proper setting? Is the compressor motor running? The compressor is a football-sized case with no apparent moving parts. It is located inside the air conditioner at the center. Is it humming or making any kind of continuous noise or causing the lights to dim? If it is making a continuous noise, and your air conditioner is still not cooling at all, there may be a serious problem with one or more of these areas:
These items are not user serviceable. You will need to contact a qualified appliance repair technician to repair these components.
If the compressor is not running but you do have power to the air conditioner there may be a problem in one or more of these areas:
hey there, it seems you know a little about the troubleshootig. The first thing you need to do is see if the rela is trying to energize by checking for 24v accross the coil while it should be running. I am guessing that with a 1/8 hp this is the condenser fan motor (outside). If you are not getting 24v at the coil is your compressor coming on? You may have a safety switch with a manual reset (usually red button) on the piping under the fan motor or just a broken wire. If this is a heat pump and the relay is located on the circuit board and the compressor is coming on,chances are the board is bad. If you only have 2 stat wires coming into the unit, check for 24v on them wait for any time delays. If it is there and at the coil replace the relay. If the 24v is not outside at all, check iside or try different collor wires, one may be broken. If still no 24v, take the tstat off the wall, turn off both units to kill power, twist the wires from terminals G, Y and R together. This should bring it on. If this is the only way to bring it on, replace the tstat. Also, there may be a float switch in a condensate pan somewhere on the indoor unit. If the pan is filled with water, it will either kill the whole 24v circuit or just keep the outdoor from coming on. Let me know what you find seth
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.