Coleman Mach RV Air Conditioner Troubleshooting: 6 Recommended Fixes

Most campers come with Coleman ACs. While the machines are affordable and reliable they are not prone to problems. But don’t worry!

This Coleman Mach RV Air Conditioner Troubleshooting pro guide addresses problems such as why won’t the AC turn on or off. Why does it not cool or heat properly? Issues with the thermostat setting and their solutions.

With our in-depth research, we also have solutions to uncommon problems with compressors that are quite difficult to understand. So bring out the tools and start reading.

Why the Troubleshooting? Importance Discussed!

Coleman Mach ACs units are produced by the company with the same name.

Although, do not forget proper timely maintenance. There are countless problems you can avoid if you are well-versed in fixing these. The following issues and more may impact a unit’s overall efficiency and lifetime:

Coleman Mach AC Troubleshooting Guide: Causes and Solutions

Frequent servicing can help in preventing the rise of more critical problems that could require major repairs. Troubleshooting can also assist in locating any safety issues that can compromise the environment or the RV’s passengers. For example electrical troubles or refrigerant leakage.

This is why the following section will address common issues, their causes, and dedicated solution.

1. Coleman Mach AC Not Turning On

Believe it or not, but like other brands, it is possible that the Coleman Mach air conditioner won’t switch on. To make it go back to functioning properly here is what you need to know.

Likely Cause

First, let’s determine the root of the trouble. If the Coleman RV air conditioner does not switch on the problem could lie with one of the following:

1. Non-Responsive Remote
2. Power outage.
3. Blown fuse.
4. Faulty wiring.
5. Tripped breaker.
6. The unit is not plugged in.
7. Bad thermostat.
8. Capacitor malfunctioning.

2. Coleman Mach AC Not Turning Off

This issue does not happen often. Although in the likely scenario where you are unable to switch off the Coleman Mach Air Conditioning unit, read below.

Likely Cause

Let’s learn which component can cause this to happen:

1. Dirty condenser coils.
2. Defective thermostat.
3. Faulty Relay board.
4. Flawed control board.
5. Malfunctioning Main control board.

3. Air Conditioner Not Blowing Cooling Air

There could be many reasons why your RV air conditioner does not blow cold air as it should. Scroll down to see as we get to the bottom of the ac unit not throwing cool air.

Likely Cause

Owners of the Coleman Mach air conditioner have regarded one of the following components responsible:

1. Dirty air filter
2. Wrong setting
3. AC with less BTU
4. Low refrigerant
5. Issues with the fan motor
6. Faulty Thermostat
7. Malfuntion in Compressor
8. Faulty Control board

4. AC Not Blowing Heat

If you invest in a thermostat model that can both heat and cool, it is rather disappointing when it fails in harsh weather. Good thing Coleman products are fixable. Let’s learn more.

Likely Cause

To get your unit to start blowing hot air normally inspect the following:

1. Issues with Power distribution
2. Unclean filter
3. Incorrect temperature setting
4. Frozen coils.
5. Leaky refrigerant
6. Faults in the wiring
7. Problems with heat strip or fan

5. Compressor Not Working Properly

If the Coleman Mach air conditioner is having issues with its compressor unit, we have some troubleshooting steps you can do to overcome that. Have a look at the causes and solutions.

Likely Cause

Malfunctioning air conditioner compressors can have problems due to:

1. Frost collected.
2. Dust and dirt in coils
3. Burnt overload Thermostat
4. Temperature control board
5. Fault in Compressor

6. Fan Not Working Properly

Fan and its motor can fall victim to damage or underperform due to few components of the AC unit. Let’s learn how to diagnose and fix it.

Likely Cause

1. Faulty or damaged fan motor.
2. Worn-out fan blades.
3. Burnt thermostat.
4. Blower motor.
5. Malfunction with the relay board.
6. Problems with the capacitor.
7. Flawed control board.

RV Thermostat Setting

The Coleman Mach thermostat is not programmable. It operates on an analog system. This signifies that there is no mechanism to change the set temperature automatically and that all settings must be adjusted manually by the user.

Although it makes them simple, and easy to operate. They are however more likely to break but still considered very high-tech. More on this is below.

Temperature and Hot Air

It is possible to change the room temperature while using a Coleman Mach, however, the actual temperature is not indicated on the display.

This might make it challenging to identify issues. So how can you fix it? We’ll let you know.

For more insights, check out this video.

Other Reasons Why Coleman Mach RV AC Won’t Work

Let’s talk about the point where you have done every recommended troubleshooting procedure but your air conditioner is not willing to work.

Remember that these are complicated machines. A lot goes into it so there are other remedies you can do that will hopefully fix them. Let’s dive into the reasons:

1. AC Unit Relay Defective

When troubleshooting AC units that are not turning on, it is important to consider the relay as a potential culprit. The relay:

2. Defective Thermostat

One possible reason for an air conditioner not working could be an issue with the thermostat. If any of the components or capacitors in the thermostat are damaged, it could prevent the air conditioner from functioning properly. Symptoms of a faulty thermostat may include:

Note: It’s essential to remember that an air conditioner’s failure might also be caused by other things, such as a clogged air filter, low refrigerant levels, or damaged wiring.

To ensure safety and stop future harm to the air conditioner, it is preferable to have a professional technician diagnose and fix the problem if you think your thermostat is faulty.

3. Inspect the Circuit Breaker

There may be other causes for the Coleman RV air conditioner malfunction than a defective thermostat. When electrical power to the air conditioner is cut off, a tripped circuit breaker is oftentimes the cause of the issue. To confirm if the circuit breaker has tripped:

Reset the breaker if it looks to be tripped. It is advisable to have a professional technician diagnose and fix the issue if resetting the breaker does not fix it.

How to Operate Coleman RV Air Conditioners

The Coleman-Mach RV air conditioner operates from the control panel located in the ceiling assembly. It has three controls which are:

Read below to learn what is possible with these controls.

Use it for Cooling

In order to make your drop a few degrees and cool the interior of the RV, you will need to follow these steps.

1. Depending on your preferred level of cooling, move the selector switch to either the “LOW COOL” or “HIGH COOL” position.
2. When the air entering the air conditioner gets warmer than the setting you’ve chosen, the thermostat will start the compressor.
3. The compressor will continue to maintain that particular temperature by turning it off and on. Change the setting to disrupt this cycle when needed.
4. Angle the louvers in the direction of where you want the air to flow. These can be adjusted to flow the air up, down, left, or right.

Short Cycling

Short Cycling is a term used to indicate how frequently air conditioners or heaters cycle on and off. The AC compressor circulates refrigerant under high pressure. This indicates that it will take two to three minutes after turning off for the high pressure to subside.

Use it for Heating

Follow these steps to heat the RV trailer:

1. Set the “LOW HEAT” position on the selector switch. This will turn on the heater’s low-speed fan and increase its heat output.
2. Adjust the required temperature by using the thermostat (temperature control) switch. The compressor is able to detect room temperature. It automatically maintains the heating by changing the on and off position when the temperature fluctuates from the desired level.
3. Now angle the louvers in the direction where you wish the air to flow. By opening or shutting it, you may somewhat modify the temperature of the discharge air.

Use it for Just Air Circulation

To control the airflow of your RV’s air conditioner, follow these steps:

Resetting Coleman Mach Air Conditioner: Steps

For friends who are unfamiliar with how to reset the thermostat’s model 9630-3361. Don’t worry instead please follow the steps below:

1. Firstly, turn the thermostat off.
2. Then, locate the fuse for the thermostat and remove it.
3. You will need to wait for 5 minutes.
4. After waiting, re-insert the fuse.
5. Wait for another 5 minutes.
6. Turn on the thermostat.
7. The air conditioner is now reset and should be operational.

Coleman Mach RV Air Conditioner Troubleshooting – FAQ

Conclusion

Let’s review what we learned. Coleman Mach produces excellent ACs. Although sometimes it won’t chill or heat the room as your desire. The reason can be dirty condenser coils, a flawed thermostat, a faulty relay board, or a defective control board.

Try cleaning the interior of the unit, checking for loose wires, resetting the furnace, and repairing or replacing the damaged parts. If you are still unsure, trust an expert to do the fix.

What hurdles did you face to get the Coleman Mach air conditioner to work and are you now able to diagnose the issue? Let us know in the comments section!