Question about Campbell Hausfeld 26 - Gallon Air Compressor

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Why is it my air compressor won't start after power fail until i shut the pressure switch off and turn back on

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Hi my name is John. Welcome to FixYa. It will happen when you have a power surge, just flip the breaker in the breaker panel and it should be OK. Thanks for choosing FixYa....John

Posted on Nov 25, 2010

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Posted on Jan 02, 2017

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Turned ac off while running well turned back on to soon


shut unit off and wait at least 5-10 minutes before re-starting. do not want compressor to struggle to start. good luck!

Jul 08, 2015 | Dometic Rooftop RV Air Conditioner

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Air compressor not unloading


Check the pressure switch. The unloader valve is actually in the pressure switch where the small air line from the tank check valve attaches to it. When the pressure switch turns the motor off it then lets the head pressure bleed off so the motor can restart the next time pressure drops in the tank. If it's not working and bleeding off the head pressure the cold start valve (the one with the pin in it) also won't open so the motor can restart and warn up properly.

Sep 09, 2012 | Dewalt D55153 1.1 HP Continuous 4 Gallon...

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My MAC 700 laboured to kick in to build pressure, and then finally quit. It won't turn on with the switch in the


All compressors dump a little air when they shut off, it's the air in the pump head and discharge tube. This bleed off should only last two to three seconds. If this pressure isn't bled off the motor won't be able to restart when the pressure drops in the tank becuase there will be too much pressure in the pump head for it to start turning again. If you have a longer bleed off or if the motor is struggling to restart most likely you have a stuck or broke check valve. It's the piece where the discharge tube connects to the tank. It's designed to let air into the tank but not back out so the pressure valve can bleed off the air in the pump. On rare occasions you can remove it and clean it out but usually they have to be replaced. You would need Makita Part Number 409004-E.

Feb 29, 2012 | Makita MAC700 2 HP Air Compressor "The Hot...

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Ingersoll Rand 3 hp air compressor builds correct pressuse but trips rest when called to restart. Changed starter and running capasitors but no change in problem.


You need to check the head unloader.
Compressed air that is trapped over the piston when the compressor shuts off will be evacuated to atmosphere through the unloader valve, to prevent that compressed air pressure from adding load to the start up of the compressor motor, when the pressure switch again calls for air. For example, the last time you did a sit-up, you may have folded your arms over your chest, or if you are particularly masochistic : - ) , even held a weight to your chest. What you were doing is increasing the load against which your muscles have to work to effect the sit up.
Compressed air, captured in the cylinder after the compressor shuts off, would increase the load against which the electric motor would have to work. It may increase the load too much, and the motor may fail to start, or it may pull too many amps and fry a fuse or pop a breaker in the panel.
When the compressor shuts off, the unloader valve operates, it unloads the trapped air to atmosphere, and that problem is solved.
The unloader valve is plumbed somewhere in the line between the compressor and the compressor tank.
It is often part of the pressure switch assembly. It will, in many cases, be opened by the pressure switch, when the air in the compressor air tank reaches the set point and the pressure switch trips the power supply to the motor off, and at the same time, trips the unloader valve to open.

it is normaly on the bottom of the pressure switch it will have a small tube hooked to it



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Jan 04, 2012 | Air Tools & Compressors

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Comperrsor pumps uoto preassure, but when the preasure drops it tries to start . The motor come on but will not turn compressor until preasure drops to about 20 lb. Then it will start and build up to...


Run the compressor until there is about 75 psi in the tank and turn it off at the pressure switch. Remove the black bleeder line from the pressure switch:
1. If absolutely no air comes out of the line you may have a bad start capacitor on the motor. Have it tested at an electrical or refrigeration shop or just replace it to see if it takes care of your problem.
2. If you get a short blast (five or so seconds) of air then nothing your pressure switch isn't letting the head pressure bleed off after the motor shuts off. This pressure has to be relieved or the motor has to fight the tank pressure when it tries to restart. Reconnect the bleed off line and turn the motor back on. If it starts normally, replace the pressure switch. If it struggles or won't start it is more indicative of a bad start capacitor.
3. If you get constant air flow from the bleed line the problem is with your tank check valve. This causes the same problem as above. Replace the check valve.

May 04, 2011 | Ingersoll Rand 30 Gallon Garage Mate...

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Turn on unit starts blowing cold air for about 5 minutes the compressor kicks off. will not come back on. you can turn it off and back on and compressor will start back up again for about 5...


soulds like when it starts the high pressure switch kicks it out when you turn the power off you equalize the pressures check you coils and filter they need to be cleaned most likely this is the problem

Sep 11, 2010 | Comfort-Aire RAD-243 Air Conditioner

1 Answer

Air compressor flips breaker before it will start?


Air compressors tend to draw more power as they age, however, will not trip breaker unless some malfunction. Here are some simple tests. Unplug compressor and turn the pump by hand, you may have to remove a cover to do this. It should turn freely; any resistance could be failing bearing (would make noise) unloader/check valve leaking allowing back pressure to pump, or failed start capacitor/start winding. Easy test for checkvalve. With pressure in tank loosen discharge hose at tank and check for air leak. Check valve should hold pressure in tank. Replace as needed. Failed capacitor/s will cause high amp draw. Remove from circuit and test. UF reading should be within 95% of printed rating. Finally, most air compressor motors have two windings, start and run. Power to windings is controlled by flyball switch inside rear of motor. This switch has contacts that can stick in start position and cause high amp draw. Examine windings for signs of overheating. Copper windings generally have color of new penny. Very dark brown windings bad news. Gook luck

Jan 06, 2009 | Air Tools & Compressors

1 Answer

Compressor will not turn off


Most single stage compressors come with a pressure switch set to shut off at 125 - 145 psi. These switches become less efficient over time and will Begin to fail but remain useful. A safety valve (brass plut with pull ring) is installed somewhere on your compressor set to open at aprox. 160psi. If the pressure switch shuts off before the safety valve activates you could probably continue to use the unit. If however you would like to have the unit shut off at 125psi replace the switch any switch that can be installed in the space allowed. The black tubing that you see is the unloader. When the unit reaches set pressure and shuts off, the small valve under the pressure switch will open and release the pressure in the tubing. This allowes the compressor to start with no back-pressure. For max. life of compressor make sure that there are no leaks in system and upplug when not in use.
Pressure switches are sold in pressure ranges from 45psi to 160psi. Some brands are better constructed than others. A squareD switch will give long life being used w/o extension cord. Good Luck

Jan 01, 2009 | Campbell Hausfeld 26 - Gallon Air...

1 Answer

Starting the unit


I am thinking it is 110 volt. the reason I mention that is because I had a similar problem with powering back on but without the air leakage. Narrowed it down to insufficient power supply. As it didn't do it all the time. And I think the built in thermo protector somehow had an effect. Think the motor heated up faster due to not enough current, and the thermo protection tried to keep it from starting but wasn't working properly to start with I don't think after it was a year or so old. It drew 15 amps, That is a big draw. Turn on a skill saw at the same time there went the breaker. Different locations it acted differently.

In your case I think if you replace that entire power switch pressure unloader assembly. It sounds like at least your describing an assembly, that definately sounds faulty and may be the root of the whole problem. Then just to check, check your amp draw for the compressor and make sure the circuit your plugged into doesn't have a lot of other demands. Better to get 25 feet more of air hose then use an extension cord, depending on your amps for your compressor.
The way it's described sounds like the on off switch, pressure switch that controls the auto on and off, and the pressure relief/unloader valve are all together. So when you say you replaced the pressure switch, did you replace the whole assembly ? If I am calling that correctly in picturing it as being one combined unit ?

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Nov 14, 2008 | Northern Industrial 2 Hp Twin Tank...

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