Coleman Mach Air Conditioner Troubleshooting [6 Proven Fix]

If you ask me what is so special about Coleman then I would say that this brand provides reliable and stylish appliances. But the question is, do these factors make a confirmation about the uninterruptible working of the appliances? Of course not! For instance, to make Coleman air conditioner work you will need a proper Coleman Mach air conditioner troubleshooting guide.

I would be more than happy to help you in this area. As a personal Coleman user I know about the potential reasons when the air conditioner starts troubling. In this article, I will be explaining the troubleshooting guide in detail.

Coleman Mach air conditioner not working – Potential issues

Your Coleman Mach Air Conditioner Troubleshooting might show the following signs.

  • AC won’t turn ON
  • AC won’t turn OFF
  • AC won’t heat
  • AC won’t cool
  • AC compressor not working
  • AC fan not working

Coleman Mach air conditioner troubleshooting guide

After mentioning the possible issues now is the time to explain every problem individually and suggest the recommended solutions for it.

1. Coleman Mach AC won’t turn ON

It is not a common issue for Coleman AC to not turn ON until and unless there is some issue. There are two possibilities for it; either the unit is not receiving enough power or any component has been malfunctioning.

  • Power outage

The Coleman Mac won’t turn ON if there is no power. Check if there has been a power outage. If not then move on to the next issues.

  • Tripped breaker

The breaker will trip to protect your system from getting damaged in case of power surge or over-voltage. A tripped breaker will prevent your AC from turning ON.

  • Blown fuse

Inspect the fuse with a multimeter, if it is showing continuity then it means it is working otherwise it has gone faulty.

  • Faulty wiring

Any disturbance in the wiring will create problems for your Coleman Mach AC to turn ON.

  • Defective thermostat

Thermostat in your AC is responsible for monitoring the temperature. Due to any reason if it has gone faulty then it will not allow the AC to turn ON.

Fix method

You first need to check if there has been a power outage or not. Presence of electricity is also mandatory. Then check if the unit is properly plugged in and the breaker has been in ON position. Inspect the wiring, thermostat and fuse for possible faultiness and if found any fix it as soon as possible. At last, if none of this works then contact an expert to get the job done.

Coleman Mach Air Conditioner Troubleshooting
Coleman Mach Air Conditioner Troubleshooting

2. Coleman Mach AC won’t turn OFF

Sometimes AC not turning OFF becomes the main problem. The possible causes for this problem are mentioned below.

  • Dirty coils

The presence of dirty condenser coils will force the compressor to be working continuously in order to keep the unit cool.

  • Faulty thermostat

A faulty thermostat will be unable to monitor the temperature change due to which the AC won’t turn OFF.

  • Defective relay board

The compressor will be deprived of getting enough voltage if the relay board has become faulty, another contributing factor of the problem.

  • Non-workable control board

A faulty control board will cut off the compressor’s voltage supply. This will prevent the AC from turning OFF.

Fix method

Firstly, clean the condenser coils. Secondly, replace the malfunctioning components like relay board, thermostat, control board etc.

3. Coleman Mach AC won’t cool:

What is the purpose of using a Coleman Mach AC when it isn’t providing sufficient cooling in the summers? There are many reasons for the occurrence of this problem.

  • Clogged air filters

Air filters being clogged will only create problems for you. Do you want to know how the air filters work? Well, they allow hot or cool air to pass through them. If they are dirt-clogged then definitely they will not allow sufficient air to pass through them.

  • Dirty outdoor unit

Condenser coils and compressor, if dirty, will not operate properly affecting the whole cooling process.

  • Incorrect thermostat setting

If you have set the thermostat temperature higher than the room temperature then the cooling process won’t take place.

  • Wrong AC size

ACs of smaller size will not be able to provide sufficient cooling.

  • Refrigerant leakage

Low refrigerant level will make it hard to absorb heat and allow cool air to settle in. This happens due to refrigerant leakage.

  • Broken fan

Fan, being the most important component of the AC, controls the cooling and heating. If it has become faulty then the process won’t take place properly.

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Fix method

Clean the air filters properly or if they need a replacement then do a quick one. Along with this, keep the outdoor unit clean as well. After this, check the thermostat’s temperature setting and make it correct. Upgrade your AC if it is undersized and also have the refrigerant fixed by an expert. In case of malfunctioning components, contact a technician and have them replaced.

4. Coleman Mach AC won’t heat

The Coleman Mac won’t heat due to the following reasons.

  • Dirt-clogged filters

Dirt clogged filters will most probably won’t allow air to pass through them, whether it is hot or cold air.

  • Wrong thermostat setting

In this case, if the thermostat temperature settings have been adjusted higher than the room temperature then the sufficient heat will not be provided.

  • Frozen coils

Frozen coils become a big hurdle in allowing the hot air to pass through them. In order for the process to take place properly, it is important to make the coils unfrozen.

  • Low refrigerant level

Due to refrigerant leakage, the overall level of the refrigerant becomes low which leads to poor absorption of cool air.

  • Defective heat-slip

A defective heat-slip will not produce hot air, keeping the atmosphere cool.

Fix method

The very first thing that you need to do is clean the clogged filters. After that adjust the thermostat’s temperature settings and make them correct. Thaw out the frozen coils and replace the defective heat-slip. Moreover, call a technician to adjust the wiring and refrigerant level.

5. Coleman Mach AC compressor not working

I have mentioned the compressor being faulty in many problems but what actually makes the compressor faulty? The reasons are mentioned below.

  • Frozen coils

Due to low-refrigerant level the coils experience a frost build-up which affects the working of the compressor.

  • Burnt overload

The main job of overload is to protect the compressor from overheating. If the overload burns itself then the compressor will stop working.

  • Faulty thermostat and control board

The presence of a faulty thermostat and control board will prevent the compressor from working properly.

Fix method

You need to thaw out the frozen coils and replace the overload at your earliest. Along with this, call a technician to have your thermostat and control board checked.

6. Coleman Mach AC fan not working

In case your Coleman Mach fan has stopped working, consider the following reasons.

  • Defective fan-motor

A defective fan motor will not be able to blow air properly.

  • Bent blades

The presence of bent blades will also make it hard for the fan to provide any air.

  • Burnt thermostat

The fan won’t work if the thermostat or the blower motor has been burnt.

  • Faulty control board and relay board capacitor

If you want your AC fan to work then the control board and relay board capacitor should be operational.

Fix method

Call an expert and have all the faulty components replaced.

Coleman Mach Air Conditioner Troubleshooting
Coleman Mach Air Conditioner Troubleshooting

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Frequently Asked Questions:

Why is my Coleman AC not working?

Coleman AC might not work due to the following reasons.

  • Blown box fuses
  • Tripped circuit breaker
  • Insufficient power supply
  • Faulty compressor

How do I reset my Coleman Mach air conditioner?

A – The first step is to turn OFF the AC from the thermostat control for 15 seconds. After this, find the circuit breaker panel and shut it off from there as well. Keep it in OFF position for at least 1 minute.


In a nutshell, there are 6 problems that would cause your Coleman Mach AC to not work. I have mentioned those problems for you along with their fixes. Try them out and become a troubleshooting expert!

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