Testors Mini Blue compressor hums and won't start

by Alan
(Auckland, New Zealand)

Brand new compressor - On flicking power switch the compressor hums, the rear fan turns a few millimeters, and the cam shaft also, then nothing just the hum.


If I repeatedly turn it on and off after a few goes the cam and fan will turn close to a full revolution and then stop.

There are no gauges. I listened to see if I can hear a click from a low pressure switch but I can't hear anything.

I can turn the cam easily enough manually so it isn't stuck.

I would send it back to the manufacturer but it will cost my half what it cost in postage. I need to see if I can fix it.
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Hi Alan...

You do not indicate which model of the Mini Blue compressor you have, and without that, I can't really offer much.

These are low flow, air brush type air compressors, manufactured in China by, various other folks on the net have said, the same company that manufactures the more popular brands.

You can go here for more details:

www.allproducts.com/traffic/sparmax/air_compressor_print.html

At this point, all I can suggest is you may have a low power supply situation. A humming motor suggests that it hasn't got enough juice to start, particularly if, as you have said, the components freewheel by hand.

If you are using an extension cord, plug the compressor directly into a socket and see if that makes any difference.

Bill

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acts like theres no power going to it

by Bobby
(np nebraska)

Unplugged it with about sixty lbs of air in it. Never moved it and two days later it was empty. Plugged it back in and nothing will work.
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Bobby, you have a couple of problems, I would think.

As to the compressor being empty after 48 hours, that suggests to me that you have a tank check valve that isn't seating properly, allowing air out of the tank and then out through the unloader valve, which is now open, to atmosphere.

That or the discharge line from the tank to the discharge coupling has a leak somewhere, or, if you have an air line plugged in, you may have a leak in the line fitting.

You have checked to see if you have power to the pressure switch? Assuming you do, if you can, pull the pressure switch cover and see if power is actually flowing through the switch to the motor. It should be as with zero PSI in the tank, the pressure switch should have tripped to ON, and power should be flowing to the motor circuit.

Post a comment here with what you found, please.

Cheers,

Bill

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Air compressor will not come on

by Mark Ammerman
(Newark, Ca)

I have a 21 gallon compressor. The compressor worked one time and performed without issue. However. now the compressor will not come on. I checked and I have power to the unit.
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Mark, if you could add a comment here with more info, that would be good...

- What is the pressure showing on the tank gauge right now?

You could also see the troubleshooting section on the site map to find pages with more detailed info.

Cheers,

Bill


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There is no power going to the compressor and it's brand new used twice

by Colin
(Lee)

Had compressor from brand new used twice it now won't start has no power going to it can't understand why
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Hi Colin... I need to understand more about what you mean by no power going to the compressor.

Is it that no power is getting to the pressure switch from the wall socket, or is it that power is getting to the pressure switch, but when you check the leads going to the motor with a multimeter, there is no power going past the switch.

Add a comment here with details please, and a make and model number would be good to know as well.

Thanks,

Bill

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