Question about Dometic Rooftop RV Air Conditioner

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Hot air is going inside and the cold air is outside

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Was this just recently installed or something, or has it been working fine before this?

Posted on Jul 28, 2009

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Blowing out cold air even when the heater is set to hot setting. Feels like cold air is coming in from the outside. The colder it gets outside the colder it gets inside. 2007 jeep commander


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first the engine gets hot, if not there will no cab hot air.
so if you scan it the PCM shows the ECT reading over 180f,
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I have a Lennex heat pump unit which was installed in 2008. Our area (Savannah, GA) has experienced some abnormal cold temps lately. Yesterday, I noticed the outside of the unit had frost on the unit. ...


Heat pumps are the same as an A/C unit only it works in reverse. Instead of blowing cold air inside and hot air outside it blows hot air inside and cold air outside. The heat being blown inside is extracted form the cold air outside. Its called Latent heat Latin for hidden. Believe it or not even though its 20 degrees outside there is still heat in the air. Example if you want to drop the temperature of a freezer from 20 to 10 degrees you have to remove heat .I know your getting unusal weather and that is the problem. Heat pumps can only work no lower then around 20 degrees outside.Heat pumps are never used above the freeze line. With your unusal temperatures thats basically where you are now. Ride it out. When your temps rise a little your be fine. Im in Chicago.

Jan 15, 2011 | Heating & Cooling

1 Answer

My outside a/c condensing unit's fan runs, but inside vent air is not cold. compresser may not be running. inside vent air was cold last week. Janitrol ckj361ab is model # of outside unit.


Start the unit and go outside to see if the insulated pipe is sweating or cold, hot air should be discharging from top of outside unit. Since the breaker is not tripping, my best guess is the compressor is not operating. You might have to replace the capacitor.

If you can hear the compressor operating, then most
likely needs refrigerant

Jun 17, 2010 | Heating & Cooling

1 Answer

Heater,....


First check your air filters and make sure the inside and outside coil are clean. If they are clean and you are getting good air flow over the coils then you probably will have to get the unit charged.

May 03, 2010 | DeLonghi Trane 5t Rooftop Air Conditioner...

1 Answer

Cold air blows outside and hot air inside


Make sure it is in cooling mode. Sounds like you may have a problem with the reversing valve but you would want to check the pressures in the system first and make sure the charge isn't low.

May 02, 2010 | Heating & Cooling

1 Answer

Outside unit fan runs briefltly compressor no go inside unit fan runs but no hot or cold air


Chances are you have a bad capacitor in outside unit. Take off cover to wiring. It is a oval silver cylinder. See if it is swollen or oily. If so replace, Also check for burnt wires on capacitor or contactor. Russ

Mar 23, 2010 | Heating & Cooling

1 Answer

Uotside unit blowing cool air but hot on the inside


It sounds like you have a unit called a heat pump. When a heat pump unit is in cooling mode the outside unit blows hot air and the inside unit blows cold air. If the outside unit is blowing cold then the indoor unit is most likely blowing room temperature or warm air. It sounds like the thermostat could be controlling incorrectly or you could have a failed reversing valve which is the device that switches the unit from heating to cooling mode.

May 31, 2009 | Ruud UBHC Air Conditioner

1 Answer

Only blows hot air inside


Set thr thermostat to AC instead of HEAT.

Dec 29, 2008 | Carrier 36KCARMS Air Conditioner

1 Answer

We have a fujitsu air con model ast9lsbcw which blows cold air from the outside unit and the inside unit is not cooling the room.


Sounds like you have it in heating mode or it is low on charge. In cooling mode, the outside fan should blow hot air not cold.

Jul 30, 2008 | Heating & Cooling

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