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My air compressor won't restart

My air compressor will start when there is no pressure in tank but when it tries to restart it bogs down, stops and goes off on overload. Any ideas? Thank you

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  • cncm392
    cncm392 May 11, 2010

    Bad capacitor on motor or starter points bad or out of adjustment. More details of motor will get the correct diagnosis....

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Minimum pressure check valve is bad , does the compressor when it shuts off bleed air out at the pressure switch , if so does it continue till it starts back up , if so the unit is trying to start under a load. You have a bad minimum pressure valve usually located where the air line goes into the tank.

Posted on Jul 28, 2009

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THIS SITE IS NOT HELPING AT ALL.

Posted on Jun 14, 2013

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BLAH BLAH BLAH.....IT'S THE RESET SWITCH. JUST BY PASS IT.

Posted on May 17, 2013

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1 Answer

Compressor runs fills tank but then it wont keep the pressure, won't restart to keep pressure above requested pressure. I have to let it seat for 1/2 hour to restart again


Most likely problem is the tank fill check valve. The most common way a a tank will loose pressure is by leak-back at the check valve. This also makes it hard to start because it leaves the tank pressure on the pump head instead of letting it bleed off. The motor will only restart after the tank pressure is bleed off to a low level, reducing the back pressure the motor will have to overcome. Leaking can be heard at the pressure switch, where the air is normally bleeds off over 10 seconds or so after the motor turns off. A defective check valve will continuously leak down at the pressure switch unloader valve instead of bleeding out in just 10 seconds. The check valve is an assembly that is largely hidden inside the tank. It just looks like a large hex nut where the filler tube from the pump enters the tank. Removal usually means first removing a smaller hex/barb/connector where the smaller relief line ties into the big nut. Inspection of the check valve will easily reveal whether this is the problem.

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My 4 gallon 2hp unit will not start on its own and then the circuit breaker goes. I need to assist it to get started. Any ideas?


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Sometimes my compressor fires rite up and runs when i turn it on but more often than not it tries to start but bogs and trips a breaker. what would cause this? my friend broke the cord and replaced it...


Do you bleed down the air pressure from the tank after you use it each time. You should because you will end up wiyh water in the tank from condencation that will rust your tank out. And this will make it much easyer to start because it dosn't have to fight the air pressure that is being stored in the tank

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1 Answer

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You suspect this unit as being a two stage because of the unusually high cut off pressure. It is a single stage and the motor really has a difficult task and is being pushed to the limits. to reach this pressure. We usually reset the pressure to lower setting ~~ say around 140. Your pump probably has a leaking intank check valve (brass fitting at tank) or leaking valve plate in pump. Simple tests : with pressure in tank unplug compressor from outlet and listens for air leak around pressure switch. As you unplug the running compressor from outlet you should hear air leaking from pressure switch for just a moment as air is let out of airline from pump to tank. If air leaks out till zero pressure then change the valve. If tank holds pressure then valve probably ok. Next test, with no air in tank and air filter removed, plug in compressor and feel intake port for strong suction. If the valve plate is bad, suction will decrease as pressure neers the 120 mark till the point of feeling that air is actually blowing out of intake. With good valve plate there will be strong suction untill unit reaches set pressure. If valve plate is bad also change the cylinder and piston ring. Good luck with your repair.

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1 Answer

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There should be a device called an "unloader " connected to the machines own switch. This releases the pressure from the compressor so it can start up without the resistance of the pressure in the tank.There should be a hissing noise when the machine stops, the sound of the air on the compressor side of a non return valve being released.

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1 Answer

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1)Let your unit pump up.
2)Turn it off.
3)Find the supply line from the pump to the tank.
4)Remove the supply line from the pump head.
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5b)If you do not hear air coming from the tank, you have a leaky
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