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Carrier 42G250CF-1 won't blow cold air (on lamp flashes)

My Carrier 42G250CF-1 air conditioner won't blow cold air on the dry or moisture setting. The fan will blow room temperature air. The green, on lamp flashes five times. I'm hoping it it will be a 'simple' solution to fix the problem.

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Actually dry and moisture setting cannot cool your room because in that sitting the temperature is limited, you have to set the control in cool or auto.. If the unit is blinking try to reset the unit by disconnecting the power supply for 10 sec.("on" & "off" the circuit breaker), and test the unit.
But if wont work the unit have some defect it may be the thermistor, low freon, or the outdoor unit have some problem. Check if the outdoor and indoor unit is clean or you to call a qualified technician for this problem.

Posted on Mar 27, 2008

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Sounds like you low on freon, you will need a qualified tech to refill the freon.

Posted on Nov 21, 2007

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1 Answer

What's the difference between dry and cool setting and when should dry be used


Dry is a dehumidifier option. There is a heating element in the unit to heat the cold air back up. The cold evaporator coil causes the moisture in the air to condense on the coil (this is why the AC leaks water) and the air coming out of the vents will be cold. If you are not wanting to lower the temperature in the room but want to take out the moisture then use DRY. All ACs take the moisture out of the air when they are on COOL. So, COOL drys the air and makes it cold. DRY drys the air but warms it back up before sending it out the vents.

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My 2002 Expedition air conditioner will sometimes blow hot air and others cold air


I would check the following possibilities:
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2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.

Could be other issues, but I would start with these.

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Whenever you're using a humidifier, the amount of moisture that it will put into your air will vary depending on how warm or cold the house is. Also, it will depend on whether you not you're using a wood stove to heat with too, as a wood stove will dry out the air faster than conventional heating devices (forced hot air furnance, electric baseboard, etc.).

A wole house humidifier also will vary depending on the outside air temperature changes, so you won't need as much humidification on mild days, as you will on very cold days such as when the outside temps are below freezing.

The good news is that you've discovered the simplest way, for most people, to determine whether to turn your humidifier UP or DOWN - If you're getting moisture on the inside of the home's windows, turn it down, if you're not, you can turn the humidifier up slightly until you just see moisture starting to form on any of your windows (typically this will occur in the colder rooms first), then just turn the setting down one setting level.

The great thing about having a whole house humidifier is that you can actually save on your heating costs, as the moist air makes you feel warmer and will provide you with a more comfortable home in the winter months.

I hope you find this Very Helpful and best regards!

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This could be complicated to resolve over the internet but I'll give it a try. When you stated that it stoped blowing cold air, did it stop blowing air all together? Also is the outside unit rtunning?

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