i have to continually press the reset switch for air compressor to work, why?

by kyle
(princeton, id)

when air compressor starts to build pressure the reset switch will kick off. i have to continually press the reset switch about every minute, why does the air compressor do this?

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Kyle, the reset switch is typically a thermal safety device. If the motor overheats, before it gets to the point where heat-related damage can occur, the motor kicks off on thermal overload, allowing the motor to cool.

Sometimes the thermal switch will reset itself, sometimes it needs to be reset manually, though if you are resetting it manually before the motor cools, then you are putting your motor at risk of damage.

Why is your compressor motor overheating, that is the question?

So, two back at you that you can respond to as a comment here... are you currently using an extension cord or power bar to power the compressor.

If you empty the tank completely before starting the air compressor, will it fill to cut out, or will the motor go off on thermal during the fill, and if so, at what pressure?

Cheers,

Bill

Comments for i have to continually press the reset switch for air compressor to work, why?

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May 08, 2016
troubleshooting
by: rich

I have a 5hp single stage 60gal {PUMA}

If I hit the reset button when tank is empty and cold it will fill up and stop but not turn on
automatically. I must hit the reset again.

(Please start a new thread under Puma air compressors. Thanks. - Moderator)

Dec 04, 2014
Power supply
by: Bill

Insufficient information to make a guess.

Make sure your power supply to the compressor is good, and then check the cap.

Dec 04, 2014
Thermal reset button trips
by: Anonymous

I have the same problem . Reset button trips and motor is not hot.

Nov 09, 2014
Reset tripping
by: Bill

Without knowing the model I can only guess that your compressor motor has a start capacitor.

If it does, see the page on checking it on this site. That's what I would do next.

B.

Nov 08, 2014
Same issue but not overheating
by: Rick

I have the same problem. Everyone says overheating but it trips so quick it had no time to heat up period. Runs about 10 seconds and trips. Any ideas?

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Motor shuts off and hums

by Harold Lane
(Pittsburgh)

Hello,
I have a Central Pneumaatic 2 hp 8 gal. I ran it and it ran up to 40 pounds and shut off. The motor hums and the reset buttom is loose and stays in. This unit was purchased in 2012 and only used twice to fill a tire. Do you think the reset buttom is bad but the motor hums. Oil is good.
Thank you
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Harold, if the motor is humming, then power is getting to the motor, therefore, the reset button is allowing power through. The reset is quite likely a thermal overload and if the compressor motor hums long enough, then that reset will trigger, I would expect.

That your compressor didn't get to cut out pressure before stopping suggests that the motor doesn't have enough power to overcome the increasing load of the air in the tank.

If this is a new condition, and you ARE NOT using any extension cords or power bars to feed the compressor, my guess would be you have a motor capacitor that is wearing out.

Cheers,

Bill

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Manual for Central Pneumatic compressor Model 67847

by John Mercer
(Polk Fl.)

Looking for a manual and parts book.
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When I get one I'll post it here for others to download John. So far, no luck.

I hope someone out there can help.

Bill

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Model 90385 - Tank not building pressure

by Ray
(Pa.)

Have a Central Pneumatic 3 HP - 8 gallon compressor, Model 90385. I use it at home for woodworking. Forgot to turn it off one night and sometime during the night the hose failed! Ran for who knows how long till shutoff the next morning! It worked o.k. for awhile. Now it runs but will not build pressure in the tank? I noticed that air is coming out of the hole in the oil plug! Any help would be appreciated.
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Ray, it sounds to me as though your poor compressor has worked too hard.

If air is coming out of the oil fill vent plug, that suggests that you have more compressed air than normal bleeding by your cylinder seals into the oil sump.

So, that's your first start.

See the page linked from Troubleshooting about other things you will need to check.

If enough has broken or worn out by the unfortunate over-running of your Central Pneumatic compressor, it may cost less to get another one than fix the one you have.

If you opt for getting another, do not throw the old one out. See my video about my $10 air compressor for why.

Cheers,

Bill


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Jul 20, 2015
Central Pnematic Compressor Model; 90385
by: Bill

Tell us about the power supply, please, to ensure that isn't the issue.

Is it a 15 or a 20 amp breaker on the supply?

How many other items pull power from the same circuit while the compressor is trying to run?

Using what gauge and length of extension cord, or are you using a power bar?

Jul 20, 2015
Central Pnematic Compressor Model; 90385
by: Anonymous

I have a harbor frt. Central Pneumatic compressor model 90385 which also trips the overload reset button before reaching the factory set cut off pressure.
The compressor starts with about 50 psi of residual air in the tank. Runs for about 2 or 3 minutes and trips the overload button and the compressor shuts off. This is at a ambient (70 Deg. F) temperature at start up.
I am looking to replace the over load button if I can find the replacement Central Pneumatic part.
The compressor is 1.5 years old and we only us it for bike tires and adjust auto tire pressure. No power tools or impacts.

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