/ / / Duo Therm Brisk Air Troubleshooting: 5 Hidden Symptoms You Need to Know!

Duo Therm Brisk Air Troubleshooting: 5 Hidden Symptoms You Need to Know!

Having a Duo Therm Brisk Air unit is an excellent thing for your RV. If you’re experiencing some problems with it, then you need to be aware of the hidden symptoms associated with Duo Therm Brisk Air troubleshooting.

This blog post will discuss five often symptoms and provide helpful tips on fixing them. Keep reading to learn more!

An Overview Of Duo Therm Brisk Air

If you’re looking for a reliable and efficient cooling and heating solution, the Duo Therm Brisk Air may be your need. Keep reading to learn more about this innovative air conditioning and heating system.

What Is Duo Therm Brisk Air?

Duo Therm Brisk Air is an RV air conditioner and heater designed for RVs, campers, and other mobile vehicles:

  • It features a blower and heating coils that allow it to cool and heat the vehicle’s interior.
  • It is typically mounted in the ceiling or wall of the vehicle and can be run on electricity or gas.
  • The unit also includes air filters to help keep the air in the vehicle clean and fresh.
What Is Duo Therm Brisk Air

Who Makes It?

Duo Therm Brisk Air is a product of Dometic Corporation, a global leader in branded solutions for mobile living in the areas of:

  • Food and beverage
  • Climate
  • Power and control
  • Safety and security
  • Comfort
Duo Therm Brisk Air is a product of Dometic Corporation

Dometic has been providing comfort for years, and its products are designed to provide exceptional performance, reliability, and dependability. They offer a complete line of:

  • The RV air conditioner turns
  • Heating systems
  • Refrigerators
  • Furnaces
  • Ventilation and more for recreational vehicles
  • Boats and trucking fleets
Dometic offers a complete product line

Where Is It Used?

Duo Therm Brisk Air is often used in:

  1. Recreational vehicles
  2. Boats
  3. Cabins

This air conditioning system is ideal for cooling small, enclosed areas with limited space. It is also great for relieving the summer heat on the road or at sea.

Dometic RV Air Conditioner Troubleshooting

Let’s dive into 8 different ways of Dometic troubleshooting!

Duo Therm Brisk Air Troubleshooting

1. Examine The Duo Therm Thermostat

The first step when troubleshooting a household thermostat is to ensure the switch is in the ‘on’ position.

  • With a multimeter, it’s possible to check the range of DC volts on the terminals – it should be more than 10 and less than 30.
  • Resetting the system operation can indicate whether there are any wiring issues or problems with the thermostat itself.
  • The device may not work properly if an error is indicated on the display screen.

A replacement may be necessary if the configuration is correct, but the problem persists.

2. The Unit Won’t Power On Or Stay Turned on

It can be frustrating when your RV air conditioner unit won’t turn on or stay on. One of the common problems that people face is that the AC unit either won’t start or will turn off after a few minutes of operation. If this is the case, there is likely an issue with the thermostat.

Solution #1

One way to troubleshoot this issue is by checking for a cracked solder joint in the on/off switch:

  • This can be done by turning off the power of the AC unit, removing the panel cover, and examining the board for cracks or holes.
  • If you find one, you will need to resolder the connection.
Solution #2

Another option is to use a voltmeter to measure the current values of RV ac on the socket:

  • If the values are not as expected, then it is likely that a fuse needs to be replaced in the outlet.
  • If this does not fix the problem, then it may be necessary to get the entire connection replaced.
  • In rare cases, it may be necessary to get the wiring for your outlet replaced, and it is best to contact an electrician for this type of job.

3. Reset Your Thermostat By This Method To Stop Troubleshooting

If you are experiencing any issues with your Dometic Duo Therm RV air conditioners, one of the first steps you should take is to reset the thermostat. This can help resolve configuration errors, allowing the unit to work properly again.


To reset the thermostat:

  • Begin by turning off the air conditioner and unplugging it.
  • Then press and hold the down, up, and time buttons on the thermostat until the vents move. This process may take a few seconds and should result in the unit turning back on.
  • After a while, the unit should be reset, and you can use it again as normal.
Reset Your Thermostat By This Method To Stop Troubleshooting

Note: It is important to remember that if you still have problems with the air conditioner, you may need to call a technician for further assistance.

4. Check Your Gas Pipe From the RV AC Unit For Leakage

Most problems with air conditioners are related to electrical or configuration errors. However, some people might run into a gas leakage with their unit, which can cause the unit only to pump out warm air.


If you experience this issue, it is recommended that you contact a reputable repair agency or Dometic directly to check the tank and fix the air leakage. If your device is still under warranty, contact the company directly for a free repair.

5. Poor Performance Of Push Buttons With Potential Solution

It is common to have the push buttons of your Dometic Duo Therm Air Conditioner not working properly. The major reason behind this problem is dust accumulation beneath the buttons.


To inspect the buttons:

  1. You will need to remove the top.
  2. Then press the tabs with a small flat screwdriver.
  3. You can also use spray contact cleaner to clean the contacts.
  4. After cleaning, the top should be turned on the switch to see if the push buttons are fixed.
  5. If not, it is recommended to call a professional for further assistance.
Poor Performance Of Push Buttons With Potential Solution

6. AC Cooling At The Wrong Temperature

It is possible that your Dometic Duo Therm air conditioner could be cooling at the wrong temperature. This could happen for several reasons, including an error with temperature sensing or a misalignment of the thermostat. It can be a complex issue, but attempting to fix it yourself is possible.

Solution # 1 Check the Room Temperature

One of the important things to do when troubleshooting a Dometic Duo Therm RV air conditioner thermostat is to check the room temperature. To do this:

  • Use a thermometer to determine the temperature in the room when the thermostat stops.
  • Make sure to note down the temperature and compare it with the temperature set on the thermostat.
  • The accuracy should be within ±3 degrees Fahrenheit.
Solution # 2 Turn Off the Thermostat

If your Duo Therm RV air conditioner is not working correctly, turning off the thermostat first is important. To do this:

  • Switch off the thermostat and turn on the AC. This will tell you if the issue lies with the thermostat or the AC itself.
  • Turn off the AC after a while and switch on the thermostat again.
  • Run a factory reset. Depending on your model, this could be done by pressing the reset button on the AC unit or by going into the settings menu and selecting ‘reset’.
  • Solutions for different AC units vary depending on their type. For rear units, you may need to get a new upper board installed. Front units without a remote sensor should have one installed. Front units with a remote sensor should be checked with an ohmmeter and then find a replacement for the thermistor sensor and upper board.
  • Lastly, make sure to clean and check the filter regularly to ensure your AC operates smoothly and efficiently.

7. To Fix The E1 Code On Duo Therm Thermostat

The E1 code on a Dometic RV air conditioner indicates poor communication between the power module boards and the CCC 2 thermostat. This lack of communication is displayed on the thermostat’s display screen. An additional zone may lose contact and blink right next to the original code, indicating that the unit has multiple zones.


To fix the E1 code, it’s necessary to do a reset system operation:

  • This involves turning off all the breakers for the AC unit, resetting the circuit breaker, and then turning it back on.
  • It’s also possible to resolve the issue by tracing the cable from the Duo therm thermostat to the air conditioner.
  • If there are any kinks in the cable, they should be corrected.
  • All loose connections should be tightened to restore communication.

You can also watch the below video for help!

Access the Connections

If you are experiencing an E1 code on your Dometic air conditioner thermostat, the first step is to access the connections:

  • Make sure that all the connections are secure and none of them are loose.
  • You should then disconnect the cable and reset the system.
  • If a failure is detected in any system component, you may need to replace the thermostat.
  • Once you have reconnected the cable, check if the issue is resolved. If not, further troubleshooting may be needed.

Do Not Void the Warranty

When troubleshooting a Dometic Duo Therm Air Conditioner, it is important to remember that accidentally breaking the thermostat or AC can void the warranty:

  • If you notice any codes appear on the thermostat, it is best to contact an expert technician as soon as possible to ensure proper troubleshooting.
  • This will also help to ensure that your warranty remains intact.

8. Replacing The Duo–Therm Thermostat

If you are replacing your Duo-Therm Thermostat, there are a few important things to remember. First, household thermostats generally run on batteries, while RV thermostats run on DC power. Secondly, both thermostats must have the same terminals when replacing the thermostat air conditioner units.

Replacing The Duo–Therm Thermostat

To begin replacing the Dometic Thermostat

  • Turn off the rooftop AC power supply to the unit and begin the basic electrical work of disconnecting the wires from the old thermostat and attaching the new terminals.
  • Be sure to label the wires and keep them from sliding into the pit in the wall.
  • Please do not set up the new thermostat to work before testing all the appliances to ensure they work properly.
  • If you need help with how to do this or are not comfortable doing any of the work yourself, it is always recommended to seek professional help.

Step-By-Step Process Of Duo-Therm Brisk Air Comfort Control Reset

The Duo-Therm Comfort Control Reset will erase all previous program memory and reset to factory settings of 72 degrees F for cool and 68 degrees F for heat. To reset the Comfort Control, follow these steps:

  1. Turn the device on and check the light and annunciator data.
  2. Press the mode button to activate the annunciator light.
  3. Press and hold the up and down buttons. Use another finger to press the mode button and release it right away.
  4. Release the up and down buttons.
  5. Press the mode button again.
  6. Test the system to make sure the reset worked.
  7. Re-program the settings to the desired levels.

Note: A manual can be downloaded or obtained from a Dometic dealer for further instructions on resetting the Comfort Control.

Different Signs Of Bad Duo Therm Brisk Air

The average life of an RV thermostat is 10-15 years, so it’s important to know when it’s time to replace the thermostat. Here are some signs that your Duo Therm Brisk Air Thermostat may be bad:

  • If the thermostat does not respond to commands, it may not be working.
  • If the wires become loose, a fuse breaks, or the thermostat is disconnected, it may have no power supply.
  • The battery may be out of power if the display screen does not come on or is dim.
  • The air conditioning unit or heater may not come on when the temperature setting is reached.
  • The AC unit or heater may not turn off when the temperature setting is reached.
  • The setting on the thermostat may not match the temperature in the room.
  • The thermostat does not respond to commands.

If any of these symptoms occur, buying a new thermostat and having a professional install it is best. Buying a refurbished thermostat may not be the best option as it may not be up to date with current technology standards.

The average life of an RV thermostat is 10-15 years

The 4 Major Blowing Problems Duo Therm Brisk Air Conditioner

Here, you will read about the different issues related to Dometic therm brisk air.

Uncleaned Air Filter

A dirty filter can be one of the main causes of issues with your Dometic Brisk Air Blowing system. The filter for blowing cold air or hot air is responsible for capturing dust, dirt, and other debris from the air, so if the filter is clogged or dirty, it can restrict airflow and decrease air pressure.


To prevent this issue, it’s important to check the air filter regularly and clean or replace it as necessary. If the filter looks very dirty, it should be replaced rather than just cleaned, as it may be unable to filter out the debris properly.

Cleaning the filter is fairly simple:

  • Only warm water and mild detergent are needed to remove dirt or debris.
  • It’s also important to ensure the filter is completely dry before re-installing it in your Duo Therm Brisk Air Blowing system.

By taking these steps, you can help keep your Duo Therm Brisk Air Blowing system functioning properly.

Uncleaned Air Filter

Frozen Evaporator Coil

The frozen evaporator coil is one of the most common issues regarding the Duo Therm Brisk Air conditioning unit. It is part of the air conditioner responsible for cooling the air before it enters your home. This issue can cause a decrease in efficiency and an increase in energy bills.


  • Dirty air filter
  • Low refrigerant levels
  • Blocked drain line
  • Obstructed cold air flow

Let’s take a look at some potential solutions to this issue.

  • Clean the air filter: Cleaning the air filter will allow more air to flow freely and prevent the coil from freezing.
  • Check refrigerant levels: Have a professional check your unit’s refrigerant levels and ensure they are optimal.
  • Clear the drain line: Unclogging will help prevent any water backup that can cause freezing.
  • Open all vents: Ensure all vents in your home are open to allow unobstructed airflow to the evaporator coil.

Air Duct Issues

Air ducts are an important part of your heating and cooling system and can be the source of many issues. Poorly designed or maintained air ducts can cause problems such as inadequate airflow, inefficient heating and cooling, and mold growth.

Here are some common air duct issues to watch out for:

  • Leaks: Leaky air ducts can reduce the efficiency of your system and increase energy bills. Look for visible signs of damage, such as cracks, holes, and loose joints.
  • Dirty air filters: Clogged filters can restrict airflow and reduce efficiency. Replace your blowing cold air filters regularly to keep your system running smoothly.
  • Improperly installed ducts: Ensure all ducts are sealed properly and insulated when necessary.
  • Inadequate insulation: Proper insulation is essential for maintaining a comfortable temperature in your home. Check for signs of inadequate insulation, such as condensation or frost on the exterior of ducts.
  • Pest infestations: Insects and rodents can get into air ducts and cause health hazards and mechanical damage to the system. Check for signs of infestations and take appropriate steps to address them.

Problems With Blower

Blower issues can cause various problems with your Duo Therm Brisk Air unit. If the blower is not working correctly, it may lead to inadequate airflow, reducing your home’s cooling efficiency and comfort levels.

A faulty motor or fan belt is the most common cause of blower issues:

  • If the motor fails, it can cause the blower to run erratically or not at all. This will result in reduced airflow and cooling inefficiency.
  • A loose or worn fan belt can also prevent the blower from working properly. It should be checked regularly and replaced if necessary.


How Do You Reset A Dometic Duo Therm Thermostat?

To reset a Dometic Duo Therm thermostat, press the reset button for approximately 5 seconds until you hear a click. This will reset all of the settings back to factory defaults.

Do Thermostats Have A Reset Button?

Yes, most thermostats have a reset button that can be used to reset the thermostat to its default settings. Depending on the make and model of your thermostat, the reset button can be found in different locations.

Who Makes Brisk Air?

The brisk air is a brand of RV air conditioners manufactured by Dometic, an industry-leading company producing recreational vehicle products. Dometic has been in the RV business for over 100 years, offering some of the highest quality and most reliable products.

Can I Factory Reset My Thermostat?

Yes, you can factory reset most Dometic Duo Therm thermostats. To do this, press and hold the “MODE” and “FAN” buttons together until you hear a beep. The display will then return to factory settings.

How Do I Change The Zone On My Duo Therm?

Changing the zone on your Dometic Duo Therm thermostat is easy. Press the ‘zone’ button to select your desired zone and use the up/down arrows to adjust the temperature of that zone. The changes will be applied after a few seconds.


Duo Therm Brisk Air is a great heating and cooling system for any home, but troubleshooting it can be tricky. Following these hidden symptoms and troubleshooting tips, you can have your Duo Therm Brisk Air up and running quickly.

We hope this article has been helpful and that you feel more confident in solving Duo Therm Brisk Air issues. Have you ever encountered any of these signs when debugging your Duo Therm Air system? Let us know in the comments below!

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