Question about Dometic Rooftop RV Air Conditioner

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Air conditioner not cooling

My r/t air conditioning will not cool down during the heat of the day. Can't get it below 82 degrees.

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This is a tell tale sign that your condenser coil on the rear of your upper unit is dirty. You need to get up on the roof and remove the shroud from the unit. Gently spray into the condenser with a water hose until the water that is coming out is clean. This is a good procedure to do once or twice a year to help the efficiency of your unit.

Hope this helps.

Jeff

Posted on Jul 04, 2009

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Posted on Jan 02, 2017

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Air Conditioning Tips & Tricks You Must Know!


  • Try setting your thermostat between 72°F and 78°F. Each degree setting below 78°F will increase your energy consumption by approximately 8%. As you can see, that can add up to a lot of money over a year.
  • Inspect and clean both the indoor and outdoor AC/Heating coils. The indoor coil in your air conditioner acts as a magnet for dust because it is constantly wetted during the cooling season. Dirt build-up on the indoor coil is the single most common cause of poor efficiency. The outdoor coil must also be checked periodically for dirt build-up and cleaned if necessary.
  • Check the refrigerant charge. The circulating fluid in your air conditioner is a special refrigerant gas that is put in when the system is installed. If the system is overcharged or undercharged with refrigerant, it will not work properly. You may need a service contractorto check the fluid and adjust it appropriately.
  • Use bath and kitchen fans sparsely when you are running the air conditioning system.
  • Reduce the cooling load by using cost-effective conservation measures. For example, effectively shade east and west windows. When possible, delay heat-generating activities, such as dishwashing or baking, until the evening on hot days.
  • Try to not use a dehumidifier at the same time your air conditioner is operating. The dehumidifier will increase the cooling load and force the air conditioner to work harder, which in turn increases your utility bill.
  • Over most of the cooling season, keep the house closed tight during the day. Don’t let in unwanted heat and humidity. If practical, ventilate at night either naturally or with fans.
Room Air Conditioning Units
  • The unit should be level when installed, so that the inside drainage system and other mechanisms operate efficiently. If possible, install the unit in a shaded spot on your home’s north or east side. Direct sunshine on the unit’s outdoor heat exchanger decreases efficiency by as much as 10%. You can plant trees and shrubs to shade the air conditioner, but do not block the airflow.
  • Set the fan speed on high, except on very humid days. When humidity is high, set the fan speed on low for more comfort. The low speed on humid days will cool your home better and will remove more moisture from the air because of slower air movement through the cooling equipment. Consider using an interior fan in conjunction with your window air conditioner to spread the cooled air more effectively through your home without greatly increasing electricity use.
  • Set your air conditioner’s thermostat as high as comfortably possible in the summer. The less difference between the indoor and outdoor temperatures, the lower your overall cooling bill will be. And don’t set your thermostat at a slighter setting than normal when you turn on your air conditioner. It will not cool your home any faster and could result in excessive cooling and, therefore, unnecessary expense.
  • Don’t place lamps or televisions near your air-conditioner’s thermostat. The thermostat senses heat from these appliances, which can cause the air conditioner to run longer than necessary.
Proper maintenance of your air conditioner will also save energy. Be sure to do the following:
  • At the start of each cooling season, inspect the seal between the air conditioner and the window frame to ensure it makes contact with the unit’s metal case. Moisture can damage this seal, allowing cool air to escape from your house.
  • Check your unit’s air filter once a month and clean or replace filters as necessary. Keeping the filter clean can lower your air conditioner’s energy consumption by 5% to 15%.
  • Occasionally pass a stiff wire through the unit’s drain channels. Clogged drain channels prevent a unit from reducing humidity, and the resulting excess moisture may discolor walls or carpet.
  • *In the winter, either cover your room air conditioner or remove and store it.

on Aug 19, 2010 | Heating & Cooling

1 Answer

Cannot find a filter location for RCBA 4882GG21.


it is either in the bottom of the indoor unit itself, in the door below the inside unit (if equipped), or in the grill on the wall or ceiling

Sep 30, 2012 | Ruud Matching Split Air Conditioner

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I have a Goodman CKL24-1k air conditioner. I live in a townhouse in Louisiana on the 2nd and 3rd floors. I set the temperature to about 73 degrees during the day so I can sleep bc I work the graveyard...


I lost you at my the end but the 2 ton unit should be able to cool 960 sqft. Sounds like a refrigerant problem. Air conditioners should cool the air 15 to 20 degrees. This means 80 degrees going into the machine in the return should be 60 to 65 degrees coming out in the supply. If you are in that range than it's likely never going to cool the space.

Jul 07, 2017 | Goodman Heating & Cooling

1 Answer

It is 106 degrees outside, I have a a/c unit which is cooling at 75 degrees in a 1180 square foot townhouse apartment, this seems like the unit is doing all it can with the excessive heat, is it


Unfortunately, 7000 Btu's will not cool 1180 sq ft. At best, it's rated for 400 sq ft, as it's only rated as a "Room Air Conditioner". To cool 1180 square feet, you'll need at least 30,000 Btu's (like in Central Air Conditioning) or 4 more window units spread out throughout the condo. It takes more Btu's to cool, than it does to heat.

I really sorry. I wish I had better news for you. Thanks for choosing FixYa.

Aug 02, 2011 | LG Heat cool Window Air Conditioner

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Air coming out of vent very low and not cold


Try cleaning the coils with a wire brush and soapy water.

Aug 11, 2009 | Whirlwind FH-778 Air Conditioner

1 Answer

My r/t air conditioner will not cool down pass 83 degrees during the hottest part of the day.


Have you checked the filters to make sure they are clean?
If they're clogged they'll prevent the unit from cooling.

Jun 29, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Cools only at night


Possibly low on gas . Take Thermometer and check the outgoing air. Should be close to 45 degrees If not low on gas. Rusty

May 06, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Air conditioning unit not cooling


the problem sounds like a defective capacitor its located on the condensing unit outside, also a contactor that is used can be defective also.

Jun 05, 2008 | Carrier 38CKC036 Air Conditioner

1 Answer

Danby Portable Air Conditioner DPAC120068 - room temperature


Maybe, the compressor isn't starting? I'd take it back to where you purchased it.

May 18, 2008 | Danby Portable Air Conditioner

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