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Compressor builds pressure but trips reset button on motor.
by Brad Beal
I have a 60 gallon Kobalt compressor about 4 years old. It will build pressure as it is suppose to but when it goes to shut off it starts shattering then shuts off.
Once the pressure has dropped it will not start automatically,
I have to push the reset button on the motor and it starts. Does this every time. Ive 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.
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 under powered, 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 compressor won’t shut off
doesn’t shut off when requested psi is reached
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?
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