a 6ya Repairman can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Repairman (only for users in the US for now) and get all the help you need. Goodluck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
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.
There seems to be a problem with the wiring of the thermostat. Apparently the thermostat is calling for cool (if wired properly), but is not being satisfied. The thermostat is just a switch. When there's a call for cool, the thermostat sends 24-28 volts to the contactor (inside the condensing unit to start the compressor and outdoor fan). The indoor fan is energized through the fan relay (inside the air handler). When the temperature in the conditioned space reaches the set temperature,then the thermostat cuts the power to the contactor and it stops the compressor and outdoor fan. Check that the compressor is actually running, if not, check for 24-28 volts on the wires feeding the contactor, if there is, and the contactor isn't closing then the contactor is defective. If the contactor closes and the compressor doesn't come on, check the capacitor. If the capacitor is good then check your compressor motor. I suspect you have an improperly wired thermostat
After switching the indoor unit to cool, the indoor fan starts and the light flashes, lower the temperature setting to 16 degree centigrade. When the light stops flashing the outdoor fan and the compressor start, if not check the wiring connection going to the compressor contactor. Check if there is power supplying the holding coil of the contactor. If the contactor works, check the power on both contact points by using a volt meter. If the outdoor fan only works, you need to check line working pressure. If the standing pressure is low, compressor will not start.
For the system to work, there must be 240 vac present on one side of the contactor.The thermostat sends a 24 vac signal to the contactor causing it to close, and sending the 240 vac to the compressor and condenser fan. I would locate the source of power to the outdoor breaker and make sure that there are not loose or broken wires. Please note that the outside unit will probably have a power source that is separate from the indoor portion. Hope this helps. Dano
If the blower is working with the thermostat in the ON position that tells you that the fan motor works. In the AUTO setting... the system in controlled by the contacts in the thermostat.
1. The thermostat contacts might not be closing.
2. A contactor( or relay ) in the air handler unit(inside unit) might not be closing to send the signal to the fan motor.
It sounds like a thermostat or relay problem to me. You can email me at Starztruck4u@aol.com if you have more questions.
You will have to find the contactor which is located in the outside unit. And check the voltage at the contactor, 26 v as this is the thermostat calling for the compressor to come on. You can also push in the contactor and see if the fan and compressor start. There should be an outside fuse box close to your condensing unit. Good luck
Is the indoor unit operating? If no turn the fan from auto to on at thermostat. If the fan comes on, that is a sign that you have 24volts
present on thermostat side.
Turn AC unit off outside,turn the thermostat as low as it will go. Open the electrical panel to the outdoor unit. There is a contactor located in the unit, push the plastic bar in the middle of contactor. If it pushes
in, you have low voltage wiring problem from the outdoor unit to the
If you are skilled or know somebody that is with electrical, turn the power back on to the outdoor unit take a non conductive object and
push the contactor in, the unit may start. If it doesnt start,check the
breaker for the ac unit to make sure it is not tripped.
If the breaker is not tripped and the condensor fan comes on and the
compressor does not come on and the breaker does not trip, then it
is very possible that you will need a new capacitor and while you are
at it put in a hard start kit.
This unit according to you, still should have 2 years left on the compressor warranty.
If the fan starts by pushing on it, it's the fan section of the capacitor and it needs to be replaced ($30-40, do it yourself). If the fan doesn't take off when you spin it, turn off the power and follow the wires making sure they are in good shape and tightly connected. With the power to the outside unit off and the inside section on, turn the temperature inside down as low as it will go, go outside, turn on the power and use a voltmeter to verify there is 208-240 volts going INTO the main contactor and OUT OF the main contactor. If you do not have 208-240 volts coming out of the contactor (WHEN IT IS PULLED CLOSED, most units have a 5 minute delay) then it is most likely the contactor points. Turn off the power and replace it or file the points clean. Before removing anything, make a close up video or take good pictures to be used for reassembly. If the fan has power, doesn't start by pushing it and feels warm or hot, wait an hour for it to cool off and try it again. If it still doesn't start, it's most likely a bad fan motor and needs to be replaced. Ron
Does the indoor blower come on? If not you might have a low voltage problem in your thermostat circuit or blown breaker or fuse for your furnace which energizes the contactor outdoors. If indoor blower runs check if their are any fuses in your outdoor disconnect.