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My Dimplex DAC12AC aircooler is blowing out hot air

When you turn the air cooler on it blows out room temp air rather than cool air. I have tried to put the cooler all the way down to 17c but it still just blows hot air and i have no idea why. Oh and when it has been running for more than 30mins an E3 symbol comes up

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Re: My Dimplex DAC12AC aircooler is blowing out hot air

Hi,its possible have a problem your PCB Board ,the 17c is so cool setting but blows hot , and the E3 simble its min High Cooling , pls check ur PCB board to the nearest service center.

Posted on Jan 12, 2008

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Honeywell 97-4118/5-89

probably low on freon. i assume compressor is running?

Jan 25, 2014 | Honeywell ER150B Air Conditioner

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Find a reputable HVAC contractor to do a room by room analysis with heat and cooling loads calculated and units sized and duct requirements and compare to what you have.

The air not being cold is not necessarily an indicator of anything malfunctioning. High efficiency units for instance don't produce cold air.

Since you have had someone look at it, the duct work may be collapsed which restricts air flow or uninsulated which warms up the supply air. Either one is a possibility. Any Cox Cable guys been stompin' around your attic lately? Wouldn't be the first time.

Usually, when the air coming out of the vents is not cold enuf it's because your freon level is low. Probably leaking, but they can usually recharge the freon and it will work for a while. Try another repair company and see if they can recheck the freon level.

We have a high efficiency unit and it produces cold air, so I don't know what previous poster is referring to. Air conditioners are supposed to blow cold air.

Sorry, to tell ya but it is normal if the outdoor temperatures are much below 45 degrees. Below 45 degrees there is little heat outdoors for the heat pump to grab to heat the home so it will run 24/7 and blow cool or cold air. Below 45 the temp of the air coming out the vent will decline and you will get no heat from the heat pump itself as you near freezing.

Your emergency heat or auxiliary heat is electric strip heat. But it only kicks in during normal operation if the temp in the house drops 3 degrees below the setting. (some tstats if can be 5 deg.) Otherwise the heat pump will blow cool or cold air the rest of the time if it is too cold out.

To prevent it from running all the time and blowing cold it is recommended if the temp outside is falling below 45 degrees you should just switch to the emergency heat setting, which shuts the pump outdoors off, and just heat with the electric.

But if there is no heat outside the heat pumps will blow cold. They are the cheapest and most efficient forms of heat but only as long as the outdoor temp is above that 45 deg..

I'm guessing that if you haven't experienced this you live in some place with moderate winter temperatures like in Northern Florida and rarely get very cold winter temps like the freezing you have seen there recently.

It will likely blow much warmer when the outdoor temp rises.

Aug 02, 2010 | Air Conditioners

2 Answers

AC is running continously but it is not cooling.

You mean the evaporator has no condensate? Is the condensor hot? It sounds to be in need of servicing. The temp coming out of the evaporator should be 10 to 20 degrees cooler than the air in the room which is being blown through the evaporator to be cooled. No condensation, either low humidity or no refrigerant in system. You may need to call an a/c repair. Good Luck, Ned---- The condensor is the outside unit and there should be no water coming from it and it should be blowing hot air

Aug 27, 2009 | Carrier 38BRC048 Air Conditioner

1 Answer


I know there are not that many sites--very few--that cover the informational guidance on the maintenance and technical difficulties of evaporative coolers, and so I feel compelled to share with you this very good, but rare, handyman site that does:

As you'll see, the link above has a section dedicated to evaporative coolers.

As to your specific problem of your cooler's blowing hot air, yes, the humidity is listed as one of six (6) possible causes of this cooler problem. To find out whether the other five causes are applicable to your situation, here is the direct link to the diagnostic article on hot-blowing coolers:

You should be able to review this article, and, one by one, determine what causes listed therein are not affecting your cooler in order to ultimately end up with one remaining listed cause that is the likeliest cause of your cooler's failure to blow cool air into your house.

This should help.

Good luck!


Jul 08, 2009 | Mastercool 67680 Evaporative Cooler Air...

1 Answer

Remington PTAC Heater/Cooler

you may have a bad heat sequencer

Jan 11, 2009 | Air Conditioners

2 Answers

Problem with mitsubishi air roof units

to tricked the thermostat only a way i know,to put on it an ice cube for a while.propably wrong choice to installed roof unit you must installed to the floor better for the ac and to you

Dec 13, 2008 | Mitsubishi Mr. Slim MXZ30TN Air...

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