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Husky air compressors, like any air compressor, may start up and appear to be working as normal, only for them to then undergo difficulties in reaching their cut-off pressure. This article will provide you with the most common reasons why your Husky air compressor won’t reach cut-off pressure, along with existing reader questions & responses.
Table of Contents
- Reasons Husky Air Compressor Not Reaching Cut Off Pressure
- FAQs (Frequently Asked Questions)
- Reader Questions & Responses
Reasons Husky Air Compressor Not Reaching Cut Off Pressure
The most likely reason why your Husky air compressor is not reaching cut-off pressure is due to failing or compromised parts. These include:
- Intake valve
- Piston seal
- Pump pressure valve
It is very possible that your compressor appears to be working fine, but during cycling, the air is unable to flow into the tank due to a failed gasket. Another possibility is a failing air intake valve, where the air will blow right back out of the intake valve instead of being properly drawn into the compressor.
If the piston rings or their seals are flawed, the pumps will lose pressure and efficiency, resulting in a lack of pressure being built in the compressor. The pump pressure valve could be faulty, allowing air that flows into the tank through it to be drawn right back out of the tank.
Other possibilities include system leaks, for more information on these reasons visit our Air Compressor Won’t Reach Cut-Out Pressure Troubleshooting guide!
FAQs (Frequently Asked Questions)
Your air compressor is running but not building pressure because you’re likely to have one of your crucial components at fault. It could be as simple as a system leak, or you could have issues with your gasket, intake valve, piston seal, pump pressure valve, or tank check valve.
Reader Questions & Responses
Husky Air Compressor Won’t Reach Cut Off Pressure – Husky Air Compressor Troubleshooting
My Husky compressor is 3 years old. When you plug it in (directly to the wall) it starts and makes it to about 70psi (it is rated for 150psi) then just stops. Husky Air Compressor Won’t Build Pressure.
I listen for air leaking and there is none.
I have taken the plastic shroud of the unit to get to the motor and wires. when it stops, I put a voltmeter on the pressure check valve (located directly after the on/off switch), on the outgoing side, it reads 115v. after that, the wire disappears in the motor and I can’t find it.
If you unplug the compressor and wait, sometimes it will come on again and continue to climb in pressure. (yesterday I got it up to 125 before it shut down)
I bled some pressure off to see if it would start back up and it didn’t. I’m pretty sure I heard the unloader valve release a little pressure when the motor shuts off.
Not sure what to do next… I could find a ‘button’ to push for a thermal overload.
The only else I can see on the unit is 2 capacitors and whatever the bronze-colored thing is in the picture I attached
Thanks for the help!!!!!!
See the page on checking capacitors on this site.
The bronze thing is the centrifugal switch that cuts the start cap out as the motor gets to speed.
Please let us know what you find in a comment.
I checked both the capacitors as it said to… I used a digital multimeter, set it to DC……..
the volts would go up to 3v, then I switched which tabs the leads were on and it would too -2.8v. I switched back and forth multiple times on each of the 2 capacitors….both seemed fine
Any other thoughts out there?
Does that mean you got to where you switch to ohms?
And watch the ohms go up, and reverse, and see the ohms go negative and then back up?
So, since I wasn’t good at checking ohms, I bought a new pressure switch, start capacitor, and run capacitor. put all the in, and it still does the same thing……runs for a bit then shuts off without reaching 150psi and won’t come back on even if I pull the bleed-off valve…….
What else is there to replace?
Thanks for the help… this is super frustrating.
If power is passing the switch to the motor circuit even with the compressor off, it points to a motor failure.
If power is not passing the switch to the motor circuit when the compressor stops, and if the tank pressure is below the normal cut-out pressure setting, then it’s likely the switch that’s failed.
That you have replaced the start caps, the pressure switch, the run cap, and assuming that all were installed correctly and are the correct replacements, and your compressor shuts off before the tank pressure reaches cut out, and the pressure switch is still passing power to the motor circuit, then it’s electrical, and all else is new, the problem must lie in the compressor motor.
Centrifugal switch perhaps or the motor itself opening a short when the windings warm up.
I feel ya.
So, from a cold start, it goes for some timeless than enough to fill to cutoff (or even to cut-off)? and won’t restart for a while.
How’s the motor temp right after it stops? Any odor?
Can you watch the centrifugal switch while it’s running? Does it operate shortly after the motor starts?
From a cold start, I reached 100psi, (the new pressure valve says 150)
the centrifugal switch comes on simultaneously with the motor starting. the motor sounds normal and up to speed.
I kept my hand on the motor the whole time. it got really warm but not hot enough that I had to take my handoff. I didn’t notice any smells (like something burning or melting)
thanks again for the help…..what else should I do?
Well, as Bill said, it’s likely the motor.
Is there a motor shop near you? You could take it there to have it checked. But before you do that, have you got a model number for this machine and/or the motor itself?
There’s something about this that doesn’t seem quite right to me but I’m not pinning it down, and having models may help me figure it out.
Written on the side of the tank
Husky model # 947265
Hope that helps
I didn’t see anything written on the motor itself
OK, so it’s one of those integrated motor/pump types.
It’s sounding like one of two things – either the new run cap is bad, or there is a bad winding in the motor, or it may be there is a bad connection from the run cap to the motor.
So, with the unit unplugged and cooled off, put your meter across the run cap, and if no voltage, check ohms. It should be close to zero, as in an ohm or two, perhaps. You’re looking at the cap with the motor winding in parallel.
Disconnect the meter (you can leave one lead connected if that’s easier) and turn the plugin and turn on the compressor. Wait for it to stop.
Unplug the compressor and recheck for volts, and if no volts, check ohms again. Does it read the same as the first time? I suspect you’ll see the same as when you check the capacitor by itself – if so, then the motor winding is opening under heat stress.
Let us know what you find.
And to be clear, the motor is running, yes?
Did you ever figure out what the problem was? I have the exact same issue with the same compressor.
If you have any questions regarding husky air compressors not reaching pressure, please leave a comment below, with a photo if applicable, so that someone can help you!
Mi compresor husky 20 gal no pasa de 20 psi como puedo. Resolverlo
The motor has a thermo switch when it gets hot enough the motor will cut off on its own. With the cover off the fan can’t circulate the air properly around it cool down starts back
I have the same unit with same model number and F/N number. I have the same problem with the unit. Where can a replacement sensor be purchased?
I don’t think anyone has gotten a replacement, so far.
I can’t recommend you bypass it. If you have it in hand, does it have a part number on it?
I FOUND IT!!!!!
Just inside the motor housing there is a little sensor if it’s browned that is the bloody culprit I guess you can replace it but I bypassed it and my compressor works like new.
Here a pic.
Yeah, that’s over-heat breaker. Sometimes means the bearings or something is wearing out.
Or, maybe you overworked it, duty cycle-wise.
I know what it does but apparently at some point it got overwork and that is what led to it tripping to quickly the motor won’t even get mildly warm and it would shut off like I said I just bypassed it and it works like a charm which means that replacing it on the other guys motor may solve their problems as well
How did you bypass it? Just cut the wires at the sensor and reconnected them?
Hi. I can’t see the picture. I have same problem.
Can you send me the pics?
I too have the 20 gal Husky and have exact same issue I actually had mine run fill tank shut off release pressure it would restart several times next day I would go to use it and hum and thermal switch or breaker would trip ?
THAT sounds different, actually. Have you checked the tank check valve? What else, if anything?
YouTube husky air compressor fix….red 30 gallon husky video about almost 3 minutes long
Thanks very much for that, Will I am. I have added your video to the Husky page here: https://about-air-compressors.com/husky-air-compressors/
Have a good one. Bill
I have the same problem also. I am about to turn my compressor in to a bbq pit.
Brian and Ronald – I think it’s a bit small for a BBQ…
Have you checked reviews to see how common this is and if there’s maybe a fix there?