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Kobalt air compressors are popular air compressors in today’s market as they’re Lowes’s in-house brand of compressors. One thing with Kobalt air compressors, like any compressor, they will require troubleshooting in order to diagnose & fix a problem.

This article will provide examples of troubleshooting tips, including the problems, possible causes, and solutions, for a Kobalt air compressor taken from an operator’s manual.

Table of Contents

Kobalt Air Compressor Troubleshooting

I have picked out this manual for a Kobalt air compressor which provides tips on solutions for various troubleshooting problems and possible causes.

Though these troubleshooting tips are specifically provided by Kobalt for one of their models of compressors, it is likely that you will be able to transfer this information and apply it to your Kobalt air compressor. However, I recommend reviewing your specific Kobalt air compressor’s owner’s manual to find the troubleshooting guide provided by them.

We will take a look at the possible causes, and the correct action to take for the following symptoms with tables to follow:

  • Low pressure
  • Motor will not run
  • Overheating
  • Motor stalls
  • Circuit breaker trips

Kobalt Air Compressor Low Pressure

Possible CausesCorrect Actions
Tank leaksImmediately replace the tank. DO NOT attempt to repair
Blown sealsReplace any faulty seals
Valve leaksReplace worn parts and reassemble them with new seals
Hole in the air hoseCheck and replace if necessary
Restricted check valveRemove and clean or replace
Kobalt Air Compressor Low Pressure Possible Causes and Correct Actions Table

Kobalt Air Compressor Motor Will Not Run

Possible CausesCorrect Actions
Tank pressure exceeds preset pressure switchThe motor will start automatically when tank pressure drops below the cut-in pressure
Motor overload protection has trippedLet the motor cool off and the overload switch will automatically reset
Check valve stuck openRemove and clean or replace
Possible defective motorHave the motor checked by an expert
Fuse has blown or circuit breaker trippedReplace blown fuse or reset circuit breaker
Loose electrical connectionsContact an expert
Kobalt Air Compressor Motor Will Not Run Possible Causes and Correct Actions Table

Kobalt Air Compressor Overheating

Possible CausesCorrect Actions
Poor ventilationRelocate the compressor to an area with cool, dry, and well-circulated air
Dirty cooling surfacesClean all cooling surfaces of pump and motor thoroughly
Leaking valveReplace worn parts and reassemble them with new seals
Kobalt Air Compressor Overheating Possible Causes and Correct Actions Table

Kobalt Air Compressor Motor Stalls

Possible CausesCorrect Actions
Low voltageFurnish adequate power
Defective pressure switch bleeder valveReplace pressure switch bleeder valve
Kobalt Air Compressor Motor Stalls Possible Causes and Correct Actions Table

Kobalt Air Compressor Circuit Breaker Trips

Possible CausesCorrect Actions
Low voltageFurnish adequate power. Do not use an extension cord
Restricted air passagesSeek professional advice
Backpressure in the pump headReplace the check valve and pressure switch
Excessive wire lengthConsult an electrician
Kobalt Air Compressor Circuit Breaker Trips Possible Causes and Correct Actions Table

For further troubleshooting information, visit our Air Compressor Troubleshooting, Solutions, Common Problems & Causes.

FAQs (Frequently Asked Questions)

Why would my air compressor suddenly stopped working?

If your compressor is failing to work properly, it could be as simple as a nearly empty oil tank. It could, however, be a power switch failure due to a lack of contact between the pressure switch and inner circuitry.

Why does my air compressor not build pressure?

The most common reason an air compressor will not build pressure is due to a defective reed valve exhausting air from the inlet. Otherwise, it could be a pump pressure valve, compressor gasket, piston seal, or check valve failure.

Kobalt troubleshooting related pages:

Reader Questions & Responses

Kobalt Air Compressor Trips Reset Button

Question

I have a 60-gallon Kobalt compressor about 4 years old. It will build pressure as it is supposed to but when it goes to shut off it starts shattering and then shuts off.

Kobalt 60 gallon air compressor
Kobalt 60 gallon air compressor

Once the pressure has dropped it will not start automatically,

I have to push the thermal reset button on the motor and it starts. Do this every time. I’ve checked the wiring and connections and everything looks ok. I have it wired to a 30 amp 220-volt breaker.

Any idea what may be causing this.

Response

Brad, the shattering you refer to, is this sound coming from the pressure switch? If so, your pressure switch points may be worn out and it’s time for a new one of those.

As to having to push the reset to start the air compressor, that suggests that the motor is overly warm, assuming the reset you refer to is on the motor.

Why is the motor overly warm, if that’s the case? One thing is that your air compressor is taking longer to fill to cut out pressure than it used to, the motor is running longer as a result, and that’s overheating it a bit.

More likely though, the issue may be capacitor related. A weak or failing run cap would mean that the motor is running underpowered, and that leads to overheating.

So, check the pressure switch, and see the page on this site about how to check a capacitor.

Or is the whole air compressor shuddering, as in shaking a bunch? I’m not quite sure what you mean by shattering.

Maybe you can pop back here and add a comment with more info?


Kobalt Air Compressor Won’t Shut Off

Question

Kobalt compressor doesn’t shut off when requested psi is reached.

Response

Does it continue running until the PRV pops open, or does it stop automatically at a higher than expected point?

If it does stop automatically, but at a higher pressure than expected, does it stop at the same pressure point every time?

If it runs until the PRV pops open, don’t use it again until you replace the pressure switch, and the problem is gone.

If it’s stopping consistently at a higher pressure than expected, that might indicate nothing more than an air gauge that’s failing, or it might mean that the pressure switch is failing, or both.

Maybe let us know by posting a comment here?


Kobalt Air Compressor Motor Doesn’t Turn

Question

I just buy a Kobalt 60 gal. I have power to the motor but doesn’t turn on any advice?

Response

Hi Jesse,

If you have power to the motor, then the pressure switch has tripped to on and power is flowing through the pressure switch to the motor. Is this correct?

Is the power supply to the compressor the right voltage? Often a 60-gallon tank compressor will be powered by a 5 HP motor or more, and if so, it needs a 220 VAC power supply.

If the power supply to the compressor motor is the right voltage, and the power is getting to the motor for sure, and nothing is happening as to the motor starting, then I’d look to testing the start capacitor next on the motor next. Please see the page linked from the troubleshooting page on this site about testing capacitors.

Please let us know what your findings are.


If you have any questions regarding Kobalt air compressor troubleshooting, please leave a comment below, with a photo if applicable, so that someone can help you!