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Coleman Mach RV Thermostat Troubleshooting

Coleman Mach RV Thermostat Troubleshooting

Are you tired of waking up to a stuffy RV, or one that’s too cool to comfortably begin your journey? If your Coleman Mach RV thermostat is causing discomfort, it’s time to diagnose the problem and start trouble-shooting. To help you get started, we’ve compiled a list of some common issues and their solutions.

RV Thermostat Functions

One of the essential parts of any recreational vehicle is a thermostat. It is the device that controls the cooling and heating system in your RV to keep your space comfortable and cozy, no matter the weather conditions outside. Understanding its basic functions will help you maximize its benefits and save energy. Let’s check some of the most important RV thermostat functions. [1]

  1. Temperature Control

The primary purpose of an RV thermostat is to control the temperature inside your vehicle. It allows you to set the desired temperature by adjusting the thermostat. Once the needed temperature level is reached, it will turn off the system of heating or cooling. Older models of thermostats worked by mechanical mechanisms and used mercury switches, so it is essential to make sure that it is functioning correctly.

Temperature Control

  1. Programmable Settings

Modern RV thermostats can be programmed to run automatically based on your schedule. Due to these settings, you have the possibility to set the thermostat to turn on and off at specific times of the day. This feature is useful when you’re away from your vehicle or during times of the day when you don’t need extra heating or cooling, thus saving you energy costs.

  1. Fan Control

In addition to temperature control, most RV thermostats have a fan control function. You can choose whether you want the fan to always run or only when the system of heating or and cooling is on. Having the fan always run can help distribute the air evenly, reducing hot and cold spots in the RV.

  1. Multi-Stage Heating and Cooling

These systems provide better temperature control in large RVs. These systems come with thermostats that control the multiple stages of these units, providing the same level of functionality as a traditional home HVAC system.

  1. Thermostat Compatibility

If you want to upgrade your RV thermostat, it is vital to ensure that it is compatible with the system of heating and cooling. Installing an incompatible thermostat can potentially damage or weaken your system’s performance, which can lead to expensive repairs.

The Most Popular Brands of RV Thermostats

RV thermostats are essential for keeping your RV comfortable no matter what the weather is outside. It helps regulate the temperature inside your RV, and thus creates a comfortable living environment. However, finding the right RV thermostat can be challenging, especially with the numerous brands available in the market. But, worry not! As now we will discuss the most popular brands of RV thermostats that you can choose from to ensure your RV temperature is always perfect.


Dometic is one of the most popular brands of RV thermostats available in the market. Founded in Sweden, the brand has been in business for over 100 years, and their products are known for their quality and durability. The brand has an extensive range of RV thermostats, including digital, analog, and programmable models. Dometic’s digital thermostat models are popular due to their ease of use, LED display, and backlit display for easy reading in the dark.



Coleman is another leading brand that produces high-quality RV thermostats. The brand is known for producing products that are durable and easy to install. Coleman RV thermostats come in a range of models, including digital and analog designs. The digital models come with LED displays and offer more precise temperature control, while the analog versions use a dial control to adjust the temperature.


Honeywell is a trusted brand that has been in business for over a century. They produce high-quality RV thermostats that are reliable and efficient. Honeywell’s RV thermostats come in digital and analog models and allow for precise temperature control. The Honeywell thermostat models have a temperature range of 40 to 99 degrees Fahrenheit and feature easy to use and understand controls.


Atwood is a popular brand famous for its RV appliances and accessories. They produce high-quality RV thermostats that are reliable and affordable. Atwood’s thermostats come in both analog and digital models. The analog models feature a dial that rotates to adjust the temperature manually, while the digital models come with LCD displays and offer precise temperature control.


Suburban is a well-known brand for their range of RV appliances. Their range of RV thermostats has models with analog and digital designs. The analog thermostats come with large, easy-to-read dials and are easy to install. The digital models, on the other hand, feature easy to read LED displays, have programmable options, and come with a temperature range of 40 to 99 degrees Fahrenheit.

Coleman Mach RV Thermostat: Pros And Cons

One of the essential components of an RV is the thermostat – a device that regulates the indoor temperature. With so many RV thermostats on the market, finding the best one can be a daunting task. However, one of the most popular and reliable options is the Coleman Mach RV Thermostat. Here we will explore the pros and cons of this thermostat to help you decide if it’s the right fit for your RV.

Pros of Coleman Mach RV Thermostat:

This Thermostat comes with an easy-to-understand interface that makes it easy to operate, even for beginners. The display is pretty large and easy-to-read, and it shows all the necessary information, from the current temperature to the desired temperature, and the system mode.

The thermostat is compatible with most air conditioning and heating systems found in RVs. It can work with single-stage, multi-stage systems as well as with heat pump systems, making it an excellent choice for all types of RVs. With this thermostat, you can set the temperature with an accuracy of 1 degree Fahrenheit, ensuring that your RV stays comfortable.

The discussed thermostat features a programmable feature that allows you to set different temperature preferences for different times of the day.

Pros of Coleman Mach

Cons of Coleman Mach RV Thermostat:

Compared to other RV thermostats on the market, this one has fewer features. It doesn’t come with Wi-Fi connectivity or voice control capabilities, which some RVers might find limiting.

The installation process of this RV thermostat can be a bit challenging for those who are not familiar with the wiring and electrical setup of an RV.

The thermostat display lacks a backlight feature, which can make it difficult to read the temperature in low-light conditions.

Overall, this thermostat is a reliable and user-friendly option for your RV. With its easy-to-understand interface, precise temperature control, and compatibility with most air conditioning systems, it’s an excellent choice for most RVers.

How to See The Thermostat Is Malfunctioning

A thermostat is a crucial component in every heating and cooling system. It regulates the temperature in your home and ensures you’re comfortable during the different seasons of the year. Let’s look at how to know if your thermostat is malfunctioning and what to do if it is.

  1. Temperature Fluctuations

If your home feels abnormally hot or cold, even when the thermostat indicates the temperature is okay, that’s a sign of a malfunctioning thermostat. In such cases, the thermostat might be reading the wrong temperature, and it won’t be able to regulate correctly. To test if your thermostat is accurate, get a digital or analog thermometer and place it next to the thermostat. You can also move it to different sections of the house and monitor if the temperature readings are consistent. If not, you’ll need to consider replacing your thermostat. [2]

  1. Delayed Response

Another common symptom of a malfunctioning thermostat is when it takes too long to respond to temperature changes. If you’ve noticed that your home takes slightly longer to cool down or heat up, your thermostat could be the culprit. Delayed response can indicate that the thermostat’s sensor is faulty. In such cases, you might need to replace the sensor or replace the entire thermostat unit altogether.

  1. Short Cycling

Short cycling occurs when the thermostat turns on and off repeatedly within a short time. It not only affects the temperature regulation in your home but also puts a considerable strain on your heating and cooling system. The problem can arise from various issues such as the thermostat’s wiring, temperature sensor, or loose wires. If you notice short cycling in your thermostat, you should consult an expert technician as soon as possible. [2]

Short Cycling

  1. Blank Screen

If your thermostat’s display is blank and not showing any numbers, it might not be communicating correctly with your heating and cooling system. You can try changing the batteries and resetting the thermostat, but if that doesn’t work, you might need to replace it.

  1. Electrical Issues

Lastly, if you notice some buzzing or clicking noises coming from your thermostat, that can be a sign of electrical problems. Electrical issues can arise due to loose wiring, damaged circuits, or faulty connections. If you notice buzzing or clicking sounds coming from your thermostat, you should seek the services of a professional technician to diagnose the problem.

A malfunctioning thermostat can cause a lot of inconvenience to your home’s heating and cooling system. If you’re unsure about how to diagnose or fix a malfunctioning thermostat, it’s always best to let a licensed technician handle it.

Causes of Coleman Mach RV Thermostat Troubleshooting and Popular Fixes

If you own a Coleman Mach RV thermostat, you know firsthand that it’s a vital component to ensure a comfortable RV trip. The thermostat regulates temperature and ensures your RV has a stable internal climate all year round. However, like any electronic appliance, it’s prone to malfunctioning, which can pose a significant inconvenience, especially while on the road. But what are the common causes behind its malfunctioning, and what fixes guarantee precision performance? Let’s find the answers to those questions and more.

Poor Installation: Sometimes the reason for the dysfunctional thermostat is as simple as its improper installation. A faulty connection can trigger intermittent cooling or heating, and this can significantly affect RV travel. To remedy this, ensure the wires are appropriately connected to the designated terminals, and the thermostat is mounted securely.

Electric Connection Failure: Electrical connection failures could be the source of your troubles. The water heater, air conditioner, and furnace in an RV all run on one power source. If there’s a failure in the electrical connection, the thermostat won’t activate or detect internal temperature changes. Check the fuses and circuit breakers to ensure all electrical connections are in order.

Dirty Air Filters: Filters play a critical role in ensuring the air conditioner or furnace works effectively. If they clog with dirt or debris, it could lead to an imbalance and malfunction of the entire system. The result could be your Coleman RV thermostat working hard to maintain temperature levels, which could cause frequent shut-offs or breakdowns. Hence, ensure the filters are changed regularly and cleaned frequently.

Bad Thermostat Board: If you’ve checked the installation, electrical connections, and filters and still experience issues with your thermostat, it could indicate a defective thermostat control board. Sometimes the boards go out and result in the thermostat not working, which can cause significant problems, particularly if you’re trying to survive extreme temperatures or need the thermostat for an emergency. Contact a professional to replace the bad board.

Dead Batteries: Although a minor issue, dead batteries can cause significant trouble if you’re not prepared. In some cases, the thermostat display might indicate one temperature, and the temperature on the floor or ceiling might differ by several degrees. If this happens, check the batteries and replace them if required.

Having a functional Coleman Mach RV thermostat is essential for maintaining a comfortable temperature while traveling. However, things can go wrong, and if the thermostat fails, it leaves you with a miserable experience – be it extreme temperatures, unstable heat readings, or shut-offs. Therefore, it’s critical to understand the causes and fixes of the different problems that may arise with your thermostat. Remember to check the wires, electrical connections, dirty air filters, thermostat control boards, and batteries. In most cases, these fixes should eliminate any headaches and ensure the thermostat works correctly. Nevertheless, if you experience difficulties, don’t hesitate to call a professional. By adhering to these tips and tricks, your Coleman Mach RV thermostat should deliver optimal performance and reliable climate control in your RV.

Causes of Coleman Mach RV

How to Test Your Thermostat

One of the most important parts of any RV is the thermostat. Whether you are traveling in the scorching heat or freezing cold, you need a reliable thermostat that keeps your RV at the right temperature. The Coleman Mach RV thermostat is one of the most popular options for RV owners. But, it can be frustrating when your thermostat stops working or gives incorrect readings. Luckily, testing your thermostat can be an easy task, and we’re here to help you. Keep reading to learn how to test your Coleman Mach RV thermostat.

The first thing to check when your thermostat isn’t working right is the power source. If it’s not getting enough power, the readings could be off. Start by checking the RV battery to ensure it’s fully charged. Next, check the circuit breaker to make sure it’s not tripped.

Loose wiring connections can also lead to thermostat malfunctions. Look at the wires connected to your thermostat, and make sure they are firmly attached. Check for frayed wires or any damage that may have occurred.

The most important function of your thermostat is to control the temperature of your RV. You want to ensure it’s working properly, so test the temperature accuracy. You can use an external thermometer to compare the temperature readings of the thermostat and make sure they are the same.

Another important feature of your thermostat is the fan function. Switch between different fan functions and see if the fan responds accordingly. If the fan does not switch to the appropriate speed or doesn’t turn on when you switch it on, there may be an issue with your thermostat.

Finally, observe the display of your Coleman Mach RV thermostat. The display should show the correct temperature and function setting. If you observe any anomalies or if the display doesn’t turn on, it may be time to replace the thermostat or seek professional assistance.

Testing your Coleman Mach RV thermostat may seem complicated, but it’s an easy task if you know what to look for. Start with the basics of checking the power source and wiring connections, and then move on to testing the temperature accuracy and fan functionality. And if all else fails, don’t hesitate to seek professional assistance. Your RV thermostat is one of the most important pieces of equipment that keeps you comfortable while traveling, so make sure to test it regularly and keep it in good working order. Happy travels!

Coleman Mach RV Thermostat Maintenance

The Coleman Mach RV Thermostat is certainly one of the most essential components of any RV. It is what allows you to be comfortable no matter how hot or how cold it is outside. Without it, your RV wouldn’t feel like home. Since your RV thermostat plays such a crucial role in your comfort, it is important to take care of it properly.

  1. Clean the Thermostat Screen: One of the easiest things to do in order to maintain this thermostat is to clean the screen regularly. With kids or pets on-board our RVs, there might be fingerprints or dust that might accumulate on the screen over time. To clean the screen, use a soft cloth and a mild cleaner. Do not use any chemicals.
  2. Check the Batteries: This thermostat runs on batteries, and you need to make sure that you change them at least once a year. We suggest that you keep a spare set of batteries in your toolkit, so you are always prepared. Low batteries can cause communication issues between the thermostat and your HVAC unit, leading to HVAC issues.
  3. Regular Calibration: Another important step in the maintenance of the thermostat is to regularly calibrate it. These thermostats should be calibrated at least twice a year to ensure that they are operating as accurately as possible. The calibration process is simple and can be done easily with the help of your RV manual.
  4. Inspect the Wiring: Over time, the wiring on your Coleman Mach RV thermostat may become damaged, frayed or corroded. Therefore it is essential to frequently check that all the wiring connections are tight, undamaged, and free from corrosion. This limited effort goes a long way in keeping your thermostat functioning correctly.
  5. Upgrade to a Digital Thermostat: If your RV is still operating with an analog thermostat, it might be time to replace it with a digital one. Probably the most substantial advantage of a digital thermostat is that it is more accurate than its analog cousin. Not to mention, they are programmable and allow you to set a schedule that works best for your lifestyle. You’ll save energy and money by not cranking up the heat/AC when you come back to your rig after your adventures.

Coleman Mach RV


How do I reset my Coleman thermostat?

Step 1: Turn off your RV’s power supply by unplugging it or switching off the circuit breaker.

Step 2: Remove the thermostat cover by unscrewing it from the wall.

Step 3: Look for the reset button, which is usually located at the bottom right corner of the thermostat screen. Press and hold it down for about 3-5 seconds.

Step 4: Release the button and put the thermostat cover back in place.

Step 5: Restore power to your RV and check if your thermostat is now functioning properly.

How do I know if my RV thermostat is bad?

Here are some signs that your thermostat needs replacing:

  • The thermostat is not maintaining a consistent temperature.
  • You notice significant temperature fluctuations even when the thermostat is set correctly.
  • Your RV’s heater or air conditioner won’t turn on or turn off.
  • The thermostat’s display isn’t working correctly.

If you see any of these signs, it’s time to replace your thermostat.

What causes a thermostat to not turn on?

There are various reasons why a thermostat may not turn on, including:

  • Power issues
  • Dead or weak batteries
  • Dirty or corroded wiring
  • Tripped circuit breakers
  • Faulty control boards

If you’ve done everything you can and still can’t get your thermostat to turn on, you may need to call in an expert for assistance.

Why is my thermostat not starting?

If your thermostat is not starting, it could be due to one of the following:

  • A power failure
  • An issue with the fuse or circuit breaker
  •  A blown fuse

If your thermostat is still not starting, you will need to examine the thermostat and wiring and look for any indications of corrosion or wiring issues.

Useful Video: Troubleshooting A Coleman Mach Intermittent Thermostat Issue


We hope these tips help with diagnosing and fixing your Coleman Mach RV thermostat. However, it’s important to note that you don’t have to engage in DIY projects when faced with complicated issues. Seeking professional help is paramount to avoiding unexpected accidents and other emergencies on the road. Remember that proper use and regular maintenance can help you avoid unnecessary headaches, so keep your RV properly cared for.

  1. https://www.mortonsonthemove.com/rv-thermostats/
  2. https://hbmcclure.com/7-ways-to-tell-your-thermostat-is-broken/