A couple days back I noticed the inside temp to be 90 degrees so I looked indoors and out, I noticed my outside fan not running. so I hit the circuit breakers and tries turning unit off then on and the fan would only turn on for moments, the unit is running but no cold air. I cannot reach the main unit-it is in the garage ceiling, this has never happened before. I only rent the place but if it is a easy fix Ill do it myself. Any suggestions?
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Re: My unit is running but not cooling
Probably not an easy fix. Sounds like its shutting down on Low pressure or High pressure. Could be condenser fan motor. The easiest thing it could be would be a run capacitor on the fan motor. They usually swell up and or leak oil when they go bad. You could check on that but make sure all the power to the unit is shut off before working on it. I would just call the manager or owner myself if I were you. I'm sure he is charging enough rent for him to cover such problems. Hope I have helped.
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Check the air filter and if it is dirty, replace..
Turn equipment off and let the ice melt.
After ice melts, place a/c in cooling mode and set the thermostat to 3 degrees below room temp display.
The indoor unit fan should start blowing cold air immediately and then turn off once the room temp drops one degree below the cooling temp setting.
If the indoor unit does cycle off, check the outdoor unit and make sure it turns off at the same time.
If the outdoor unit continues to run and the indoor fan is not running, the indoor unit will ice up.
A defective compressor relay that is stuck in a closed position will cause icing of the indoor unit because it keeps the compressor running when it should turn off with the indoor fan.
Do you have an error code being displayed on the controller?
Is there an led light that is flashing on the indoor unit?
Another possibility causing the indoor unit to ice up is if the freon in the system starts to get low.
Make sure the ice has all melted for this next check.
Pretty easy to check without special tools.
If the air filter is clean and there is no dust/ dirt blocking the fins on the indoor unit, turn a/c back on to cool and check that the indoor unit fan comes on and is blowing air good.
Once everything seems to running good go to the outdoor unit.
There will be two lines with black rubber insulation covering them.
Peel back the insulation three inches on each line and observe the copper lines.
If either line starts to frost up the a/c system is most likely low on refrigerant.
Another cause of indoor unit icing could be that the aluminum fins behind the air filter are clogged with dust or other foreign material.
This would block the air that must be pulled in causing the indoor unit coil to become too cold due to lack of air flow and it will ice up.
Operating the cooling system when the outdoor temperature is below 60 degrees can cause the indoor unit to ice up also.
Florida certified a/c contractor. 30 years experience.
Hope this helps.
Is the outdoor fan running? The fan cools the coils and compressor, therefore keeping the high pressure low enough to run. Either the fan is not working or its not spinning fast enough. Check the capacitor, or just replace it.
Take a look at the condensor outside. With the unit running even on a cool day, the condensor fan (outside) should be blowing hot air. The air temp coming out of the register should be 20 degrees cooler yhan the coils in the house.. This is a reverse way to chk the evaporator temp for proper cooling. Now, the wire could be a problem if it is coming from the thermostat. Take notice of the outside unit is being controlled by the thermostat by having someone go from off to cool on the T-stst. If everything is working but the discharge air is warm your unit may need a charge. If I haven't confused both of us, I'll watch for you reply -Ned
It sounds like you are low on charge. I think you have a thermostatic expansion valve and you need to check the subcooling, you should have 12 to 15 degrees at 95. At 95 degrees your head should be about 280# for a 12 or 13 SEER unit or higher depending on the effeciency. At 78 to 80 degrees indoor depending on the humidity, that is normal. The valve will open to try to fully feed your indoor coil and it sounds like your head pressure is to low to force enough refrigerant thru the coil.
Make sure the filter and the evaporator coil are clean. Also check condenser coil in the outside unit is clean.
When unit is turned on there should be (on the led display, inside unit) one green light on for the blower and another one for the compressor, both lights should be ON untill the unit reaches the preset temp. If the light for the compressor (usually the light on the right side) does not stay ON, check the outside unit.
On the outside unit, check that when turned on, both the fan and the compressor kick in and stay running. If the fan motor stops, the compressor overheats and the thermal proteccion shuts it down to prevent damage. Also, if the R22 gas is low, the low pressure switch prevents the compressor from running.
The pressure changes with temperature, it is not a true gauge to ensure a proper charge.
You should have a 15 to 20 degree temp drop across the evap coil. (return air vs supply air)
Can you verify that the compressor is running?
Not the condenser, but the compressor located inside the condenser (outdoor unit)
it really sounds like it is still undercharged.
Check the temp drop, let me know what it is.
Also tell me what the outdoor ambient temp is.
( for example.... 98 degree outdoors with 85 degree indoor temp could result in pressures something like 325 on the high side and 75 or 80 on the low side.
With the exact same unit, but 80 degree outdoor temp combined with 70 degree indoor temp, your pressures could read 215 low side and 55 low side. Not to mention that more efficient units often have higher pressures on the low side because they have more coil space and remove heat more efficiently)
Wash out outside coil from time to time.This is the most over looked part of window units. Take care not to spray water directly into fan motor. If not real humid in house check temp coming out of ac inside and make sure filter and coil are clean. run on high speed and the air should have good force. 20 to 30 degree temp drop of room temp should be about right. Much depend on outside temp and humidity and indoor humidity plus insulation factor of area. How many people are in the area and if you keep unit on day and night .
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