Air unit is about 3 years old. Worked fine until the other day. Noticed the house wasn't cooling & checked the air unit. Unit was working, but just blowing warm air. Every 8 minutes or so, you could here it kick on & feel it cooling. It would blow cold air for about 2 minutes & then back to blowing the warm air. You can hear the compressor kick on & off when it does this. Any ideas? Thanks in advance!!!
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Since you don't give a model number, I will have to assume that it is a window unit, if not this probably won't apply. When a unit freezes up - as in ice on the evaporator fins it is usually either a low freon condition or the fan is not moving air accross the unit.
With the supper high temps that we are experiencing, many units that are undersized for the area that it is trying to cool are having serious problems. One client called us out to respond to a similar problem, so we charged the unit to factory specs. A few days later she called and said that the unit wasn't cooling properly, so we went back out. Since it was a window unit that was in the bedroom, it was a small unit. She was leaving her bedroom door open with fans to draw the cold air out to the rest of the house, which the unit was not sized to do.
It sounds like the thermostat wire going to the condenser is ground, It either got pulled loose and is touching the housing or as in most cases the wire got cut or was chewed by an animal. You need to turn electric off to both devices and physically inspect the thermostat wire going from the air handler to the outside unit, also inspect where they connect inside the unit. When you find the break, cut and strip each individual wire and securely wire nut each conducter red to red white to white and so on. There you go all fixed. That's when I give you the bill for $75...except this time you write that check to yourself. Good Luck
Your AC cooling efficiency is low when he ambient temperature is high and naturally it cools well when the outside temperature drops. Please remove the filter on the grill and try to clean it under the tap water and after removing all the dust fix it back to the unit. This would increase the cooling efficiency of the unit. Your AC is also five years old. Please avoid frequent opening of doors or windows. Ensure that the exhaust fan and the blower of your unit are functioning normal. The technician might not have done a proper job in fixing the area where the refrigerant would have leaked out. Please check the refrigerant pressure to ensure that no further refrigerant leak has taken place. Or even servicing your unit he would have punchered the tubes resulting in very slow leak of refrigerant resulting in no cooling or less cooling. It takes around a month to feel the pinch of it and the refrigerant. One fine morning after sometime the unit will run and it would start throwing hot air instead of cool breeze!
90 psi suction too high possible bad valves or non condensablies in the system (AIR) what is the head pressure and what type of freon r-22 410-A? your unit is never shutting off watch out for that electric bill. and did you take apart the condenser and clean it? Tom
The unit may be undersized,but there are other possible solutions.You can make sure you have good insulation in your attic for one.If the cool air can be kept cool longer the unit may be able to keep up.Getting double pane glass is another solution,and like the insulation will greatly lower your energy bill as well.make sure your exhaust,and return vents are open,and not blocked.The ventilation system could be undersized/clogged,or the fan may not be moving enough air through a properly sized system.There should be one speed for heating,and another (higher) speed for cooling.The outside unit may not be getting good air flow because of blockage from plant growth,or other debris.A outside unit in the shade will operate much better than one in direct sunlight.Just be sure it can get air if you place,or grow something there to shade it.Something directly over top of an outside unit will cause the air to recycle through the unit,making it less efficient.
If the outdoor unit isn't coming on then you need to have a tech come out and check that the unit is being called to come on. If not, then you need to check that the tstat is calling for cool. If it is then there could be a short in the wirning to the ouside unit. If it is being called to come on and the outdoor unit's compressor is kicking on but the fan motor doesn't, then it could be as simple as a capacitor or the motor could be bad. Either way, it sounds as though you may need to call for a service professional.
2 summers ago, exact same problem with one of our two units outside. contractor that installed the unit when home was built was not helpful and not able to come out. another a/c company explained they would not be able to make it that day, but offered knowledge that often times in my area (San Antonio, TX) ants get into the electrical contacts of the mechanical switch and block the current.
following instructions to trip all the breakers inline and checking this it was confirmed, i cleaned the contacts with pencil erasers (a trick i learned with model car electric leads) and sure enough it's still working 2 years later.
believe it or not the same year my water well had the same symptoms and it turned out to be the mechanical switch was blocked by ants also!