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Make sure the Thermostat is set correctly! The problem with mine was the temp in the house was colder than my A/C lowest thermostat setting.I had my AC temp setting on 66 degrees.The temp in the house was a little lower so the AC didnt kick on just the fan blowing cool air and no compressor working. The next day it was warmer out and the house temp was 79. So when I powered up the AC set at 66 i heard the compressor kick in and the AC worked fine.
It sounds like the unit may be over charged. Make sure the outside coils are clean and you have plenty of airflow coming out of the top of the outside unit. What could be happening is, when the temps get higher outside, so do the pressures in the system. The compressor has a thermal overload protection that will kick the compressor off if it gets to hot, which if the compressor is over charged, it will work twice as hard, over heat and shut off. You would need a technician to come out and get the refrigerant charge back to normal. Another thing that could be happening is a weak or faulty capacitor, which is a small round or oval metal object, found in the electrical compartment on the unit. This are fairly simple to change out if your comfortable with electric. I've also had to put what's called a hard start kit on compressors with the same problem, new and old. The hard start basically gives it that extra boost of power to get it up and going. I would start with the refrigerant charge and go from there. The electrical "humming" sound that you hear unless you turn the breaker to the furnace off, is the contactor on the outside unit having a call for cooling. The 24 volts come from the furnace, to the outside unit, and pulls the contactor in to power the unit with the 220 volts supplied. It is normal and you don't have to worry about that at all. I hope some of this helps and good luck!
Sounds like the compressor is shuting down on high heat.There could be a couple reasons for this. 1 Check that proper voltage is being supplied to compressor. 2 Freon level may be low.This would be a service call. 3 Bad or intermitent connection at thermostat. 4 Main contacts to compressor sticking,usually burnt or pitted.
It may be low on refrigerant. On hotter days, the compressor has to run longer to reach the temperature you have on your thermostat. Have it checked for the proper refrigerant charge and have them test how many amps that the compressor is pulluig as well. With the proper breaker installed, the unit should not be tripping out. Make sure that the breaker that is in there now is actually the proper one for your unit.
Best regrds, --W/D--
Check that the thermostat is OK. You can do this with an Ohmmeter or a Volt Meter. If it is cool only, there are two terminals on the rear. Cut power to the AC and remove these wires and with an ohmmeter, check the two terminals for continuity. If there is none, then turn the dial all the way to the coldest setting and see if it changes. If not, you have a bad thermostat. If you have continuity and the compressor still does not come on, check the Start Capacitor in the upstairs unit.
is the tstat in cool mode? if not hit the mode button untill cool pops up then hit the down airow untill desired temp. sometimes the thermostat has a 5 min delay so be patent. If unit still does not run call the service co. and find out about how long they warranty their service call. usualy one month.
The first thing to check is your breaker box. There should be one double breaker for the air handler unit, that's the inside unit, and one double breaker for the compressor, that's the outside unit. Check both breakers. If you're not sure if they've be thrown, click them toward the outside of the breaker box (off position) and then click them toward the inside of the breaker box (on position). If the breakers are on and you still are not getting any A/C take a look at your compressor, (outside unit). If the fan is running at least you're getting power. However, your compressor down inside the unit may not be getting power or it may need to be replaced. The compressor has a start-up cap. If this cap goes bad or the wires from this cap fry or corrode away, this will also keep the compressor from starting but the fan will still run. If the fan is not running it could be caused by a faulty relay inside the compressor cabinet. This relay is supposed to open and close based on a low voltage signal from the thermostat. I believe it's roughly 24 volts. This relay switches on and off the 240 volts for the compressor and the compressor fan. Often this relay goes bad or the wires leading up to it fry. If you?re going to work on the unit yourself make sure all power is shut off. There should be a shutoff switch on the outside wall near the compressor. I?d also shut the breakers off.
I'm not sure of the kilowatts. The 10 min on and 5 off is telling me there is to much heat by the thermostat or you house needs more insulation. The new compressor is designed for more efficient run time. The other thing is the unit to big for your house? It should run 10 -15 min when low humidity is in the house. Otherwise longer if its pretty warm inside.
I would check the hig voltage power supply to the unit. Check the main breaker and make sure it is on. Check the disconnect and make sure there is power at that point to the condensing unit. The contactor will kick in from the low voltage in the control circuit.