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I have a super silent 50 tc air compressor, It is getting power, You hear it hum for a second, Then it shuts right off, many thanks

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My compressor comes on for a few second, makes a slight humming sound, then goes silent; any suggestions?

Please realize I'm not a professional compressor repairman.

Your description "comes on for a few second, makes a slight humming sound, then goes silent" leaves me guessing. When you say "comes on" does that mean it "makes the pumping sound of a compressor" or it "Clicks"? Allow my musings.

On a plugged in and turned on compressor the compressor's pressure switch turns on the pump motor when the pressure falls below it's set low pressure threshold (usually ~ 90 psi). The pumps pushes air into the pressure tank until the pressure reaches its high pressure threshold (usually ~ 120 psi). If the compressor is not plugged in or turned on you can hear a click when the pressure switch turns on.

Aside: Leaks, of any sort, make the pumping more frequent or longer. Bad leaks can make it pump continuous because the high pressure threshold is never reached. The leaks can be in the switch, at line connections or in the pump (valves or piston rings) itself.

I once had a low-volume ultra-quiet compressor that made little more noise than a hum when compressing. If yours is not an ultra-quiet (clicks on, hums, and quits) than I'd have to guess that the pump might be binding instead of pumping. If it is binding then the motor would over-heats and shuts off.

Some compressors are oil cooled. If an oil cooled compressor was extremely low on oil would it bind? I suspect so.

If you suspect binding I'd find a parts list for your model to work from and disassemble the pump to investigate. (see link below)

That's my best guess on limited information. Good luck.

Campbell Hausfeld Air Compressor Parts

Jan 16, 2015 | Campbell Hausfeld Extreme Contractor...

1 Answer

Air compressor cannot spin up with pressure in tank sometimes

There is an unloader valve and a check valve on the discharge side of the pump. The check valve is not holding and the unloader is not dumping the pressure so the compressor cannot start. Since it is new, you may want to take it back. If not you are going to be replacing parts.

Mar 10, 2014 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

2 Answers

Super silent air 20-air compressor not running it humms for 3 seconds an then turns off every say 10- 15 seconds.

Hi, does it build up preasure? Possible problems can be too much water in the tank, air intake pluged, auto shut-off not properly adjusted or defect. Was it run hot before without oil?

Oct 26, 2013 | Silentaire Technology Super Silent 20-A...

1 Answer

Awhen i use my air gun it just started sparing oil throughgun

Hi, The compressors are cooled by oil. The motor is hanging inside the oil tank on springs. The air input on the inside is sucking oil. This means the hose on the inside is loose or has a leak.

Mar 23, 2013 | Silentaire Technology Super Silent 20-A...

1 Answer

My Black bull 4 gallon 5.0 CFM 2 HP air compressor will not start. Regardless of whether the on or off position is selected, all I get is a humming sound for about 2 seconds, then it goes silent. After a...

I need the diaphram in the On/Off pressure switch on a Black Bull- 4 Gal., 2 HP, 5.0 cfm @ 90 PSI 120 v /13.8 amp . Batch # 0911. These are the only # I can find

Jan 19, 2013 | Black Bull Air Tools & Compressors

1 Answer

Supersilent 30 gives a small sound then a click thats it

I had the same issue with my ss 20-a. I believe that it was because I used the wrong oil. Silent aire claims that you have to use their special synthetic oil. I did not know this and after nine months my compressor stopped working. I opened up the compressor and did a little tinkering. I found that the compressor shaft was stuck and not spinning. Taking a wrench and a cloth I was able to loosen it. Now it spins freely and produces pressure. I just have to wait for the silent air oil before I will let it pressurize fully.

Jan 17, 2013 | Silentaire Technology Super Silent 30-Tc...

1 Answer

I have a two yr old panisonic TC-P50S1 that wont power up . You hear it click on then it shuts off ?

Hi no power and a clicking sound usually means that your power supply is bad. You will need to replace it.
You can get parts at

Nov 29, 2011 | Panasonic TC-P50S1 50 in. Plasma LCD HDTV

1 Answer

Frigidaire Air conditioner: fas296n2a2 Compressor

Do you have an amp meter? and volt meter. Are you sure that the compressor is getting power? The click may simply be a relay closing but no power. Check both sided of the relay. You will need to trace the power and make sure that the compressor is getting power. Then check the amps to see how much power it's pulling.

Jun 15, 2010 | Heating & Cooling

1 Answer

Deep Humming Noise

if the noise continues after you power down its the cooling fan

Jan 22, 2009 | Samsung HLR5067WX 50" Rear Projection HDTV

1 Answer

Hitachi EC12 Compressor- weird hum

The burst of air you hear as the compressor shuts off is the cylinder unloading so it will not have to restart against a high pressure load. If the unloader is electrical it would explain the hum that you hear. This could be a normal function.

Aug 24, 2008 | Hitachi EC12 Portable Electric 2hp Air...

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