Electrical Troubleshooting
       Compressors Forum



Performing electrical troubleshooting on air compressors can be complex. For over a decade now I have been helping folks size their air compressors, guiding the installation of compressed air plumbing, help them understand SCFM and how their air system works.

Through this website I get tons of requests for information on electrical troubleshooting air compressors.

I am not an electrician. I understand how compressors work, and the interface between electrical power supply, the pressure switch and the electric compressor motor. I have no problem electrically troubleshooting my air compressors.

Where possible, I will be happy to provide information about my experiences with electrical troubleshooting compressors, but mostly I hope that you, with your much greater experience in the electrical side of things, will contribute to help those folks in need of some air compressor guidance.

If you have a compressor electrical problem you would like help with, please use the form. If you can offer advice to those seeking information, even if that advice is that it is time to take your air compressor motor to the shop, or some such, then please, click on the comments below and add your advice for those folks that have already posted.

As the numbers of comments added to this page grows, it gets harder to find the specific answer you are seeking so I've added a search box here for your use to help you find the information you need.

Thanks,

Bill

Electrical troubleshooting of compressors.

Got a compressor electrical problem? Or better yet, have some advice on compressor electrical issues? Please let us hear about it.

What Other Visitors Have Said

Please scroll to the bottom to see questions and advice on electrical-troubleshooting-compressors from other visitors.

Compressor motor draws too many amps? 
What would cause the electric motor on my air compressor to draw to many amps and trip breaker? The compressor ran until it had 100 psi in the tank. …

Use of Magnetic switch on compressor 
Are all piston type compressor have magnetic switch? And what is it for?

What voltage on my used compressor? 
Just got a used air compressor but not sure what voltage it is. How do I tell. How do I tell voltage of a used compressor

Plugging compressor in arcs at the plug 
When i plug in my 110 air compressor it arch's at the plug, it sounds like it wants to run before i unplug it. Do you think its in the plug?

Help with power to compressor in 100+ year old home 
My question is not so much brand specific or even a problem at the moment. I am seeking advice/suggestions regarding the installation of a new Central …

22 amp 230 volt compressor keeps burning up one contact 
22 amp 230 volt compressor keeps burning up one contact in the switch This compressor used to run every day for years with no problem. Had to replace …

110VAC air comp runs high amps 
I have a 110VAC 33 gal air compressor rated for 15 amps. Start capacitor works fine, run capacitor checks fine with meter and replaced it anyhow. Start …

Had 230 Vlt A/C running - Turned on 230 Vlt Compressor (same circuit) both quit 
Like the big dummy I am, I was working in the garage with the 230 volt window unit going full blast 25000 BTU (live in AZ), and needed to use the the 230 …

Compressor blows fuse  
my 110 compressor seems to start fine as long as I let air out to 40lbs When there is 80 lbs the motor starts seems to be running at right speed but I …

I manually spin compressor motor to start 
My 5 hp Grainger compressor motor will not turn over. It tries. I have to manually spin the pump wheel by hand before the breaker trips ??? Any info …

What is wrong with my compressor ?? 
My 220 volt 5 hp compressor quit on me. I checked the voltage to the compressor motor and I am getting 114 volts on one leg and getting 115 on the other …

Compressor not starting completely 
I just bought a used air compressor from my cousin's husband. It was working fine when he ran it for me in his garage. It had a sparking wire so once …

Compressor cuts in and out. 
I have a 2.5 hp single phase belt driven compressor. It cuts in and out while building up to its required pressure. Thought that it must be the run capacitor …

Breaker tripping and capacitor burning 
Hello! I live in Japan and have an unnamed 10gal air compressor I purchased from a friend for $60 a couple years ago. It is rarely used, but I booted …

220 motor will not fully start.  
I have a 220volt compressor...marathon motor and champion compressor that has been sitting for a few years. Cleaned it all up and squared the wiring away. …

what is the mfd rating of my Vasco air compressor motor 
what is the rating of the starting capacitor of a 5hp, 220v, single phase air compressor? the brand is VASCO.

Start capacitor 
I have a start capacitor, XUFENG CBB60, the label says: 120uF +/- 5% 250VAC C 50/60HZ 40/70/21 SH P0 and i am trying to find a replacement …

What size generator can I use? 
I have a 60gal 5hp ingersoll rand air compressor....... What size generator can I use to start and run the compressor??

motor issue 
The three and a half horsepower 110 volt electric motor runs for one to two seconds and then blows a fuse. I tried replacing both capacitors and its still …

Capacitor burning up right away on 220 Volt compressor 
I'm putting together a 220 volt compressor. I have a 3 hp motor with 2 capacitors. I wired the motor direct without a load and everything ran great at …

Air compressor capacitor keeps blowing 
I am an electrician that has done electrical work for an automobile repair shop this winter. They have a large air compressor that blows the capacitors …

What Pressure switch 
I have a 5HP single phase 240 VAC motor, which Pressure switch do I need to control this. I expect a 90-135 PSI single port will work but am not sure. …

Air compresser only working on one outlet. 
Hi, I have an air compressor that will only work on one outlet in my garage. I tried plugging it into other outlets in the garage, in our barn, and …

Alton AT01204-6 compressor won't turn on  
My compressor had been working fine except a bit sluggish coming on at times during this cold weather we've had here in S.W. Michigan. Now it won't start. …

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Can I change a 220 volt wall plug to a 110 plug on my compressor 
i have an old portable air compressor the electric wall plug it has on it is for 220 v the wire itself is attached to the compressor by way of a metal …

220 volt air compressor blows one side of a two pole breaker ... 
I have a kobalt. M : k758ov2. 7.5 Hp Peak 5.0 Hp running 208-230 volt Single phase 22 amp the air compressor is kicking off one side of a2 pole E …

Compressor motor strains above 90 PSI ... 
I picked up an AMP 120 gal compressor with a 10 hp Leroy Somer motor from an industrial company that upgraded to a much larger unit when they started media …

Magna Force compressor blew capacitor 
Tried to run 220 volt compressor powered by 6000 watt generator, 240 volt receptacle rated at 20 amps, and compressor blew a capacitor. What could cause …

Alton air compressor will not start ... 
My alton model AT01205-11 will not switch on. It has plenty of oil and all I hear when I flip the switch is a slight click _____________________ Assuming …

Air compressor drawing excessive amps ... 
I start my compressor it draws excessive amps(all lights dim in the same circut), runs at low rpms(far below normal), but does not trip the home circut …

What breaker size for my air compressor ... 
I just bought a new MaxAir 80 gallon 18.5 CFM compressor. It is rated at 21 Amps, 240 Volts. What size breaker do I need for it? I am not sure if a 15A …

Compressor motor start capacitor is blowing 
5hp GE 1phase/220v compresser motor mtd on 80gal verticle tank with single stage vtwin pump. Pump is recently new as is control switch/head bleed valve. …

Basic wiring for air compressor 4B234D ... 
4B234D basic wiring how to

Wiring capacitor on airbrush air compressor ... 
I have a Central Pneumatics 92403 Oilless Compressor for my airbrush setup. It was given to me with a bad capacitor. I have purchased the new capacitor, …

Compressor motor turns slow and trips breaker 
33 gal. 11.9cfm. craftmans. A.O.smith motor. 115V rpm3450 mod. 919.167340. motor turns slow then trips breaker work fine last time it was used. how many …

Compressor overload trips once every morning 
We had a 3phase 208v compressor that the tank developed a leak. We replaced it with a smaller single phase 208v unit. The compressor runs great all …

What wire size for air compressor ... 
What wire size should I use for 5 hp at 42 feet away ______________________ Bill says... Good question, and one everyone should ask when they are …

Checking air compressor capacitors ... 
I have a Porter Cable oil free compressor (mdl#CPF-6020-1) that pops my dedicated 20 amp 110v breaker as soon as you turn it on. The motor turns over …

3ph 5hp motor and control box, change to single ph?? 
I have a Speedaire model 1WD55, SKU-35812 2 stage, 5 hp motor-3ph voltage rating 208/230/460, current rating-14/13.8/6.9 . Can the the motor be changed …

Air compressor has no power to breaker or capacitor ... 
I just took my Emglo in for repair because it has having a terrible time starting. They replaced the capacitor, with what looks like a used one, and …

Air compressor will not kick on unless I hit the reset button 
after each cycle the pressure drops to the point where it should kick on but it will not unless i press the reset button. the motor is a 5 hp , compressor …

Air compressor burning points on pressure switch ... 
I have an Ingersoll Rand SS3660V 60Gal 3 HP compressor. About a year ago I replaced the pressure switch because the contacts on the switch were burnt and …

Plug compressor in and it hums and then stops 
Plug compressor in and hit start and it hums very little and stops and i have to reset it king craft 6 gallon 3.5 horse. __________________ Bill …

New capacitor on air compressor motor blows after 10 seconds ... 
Folling a post about a part I was looking for I found out that its called a capacitor. After finding 1 which was'nt an easy job due to where I am located, …

Compressor melted one side of plug when I plugged it in 
I pluged up my aircompressor and one side off the plug melted. ____________________________ Bill says... Yikes!!! That's not good. Sounds like …

Stop air compressor from blowing fuses on start up ... 
Compressor has work fine for 15 year. Now when you try starting it, it blows fuse. I've checked the check valve and it works. I've even bypassed …

Air compressor wiring 110 or 220 
If I have a air compressor that gives me the option to wire it either 220 or 110 volt what is the difference , which is best. Bill says... …

How do i wire a110v motor with two capacitors 
Bought new start and run capacitors, but forgot how they are wired.

5hp 110v air compressor hums after its already filled its tank and shut off 
It hums after its already filled its tank and shut off it won't start up till the pressure is at 30 or 40, and its done manually __________________ …

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My air compressor will not shut off? 
My 5HP compressor starts and runs fine but when it reaches max (shutdown) pressure it will not shut off. How do I re-adjust the controls? Thanks, Allen …

20 amp breaker on my air compressor keeps tripping 
I hard wired it with 10-2 awg, a disconnect above unit. Black/Red to the breaker. Green to ground. The breaker trips immediately, do I need a 30 amp? Unit …

Air compressor tripping switch on circuit box ... 
air compressor was working fine day before, now its tripping switch wen in use, installing lag bolts 5 and 6 inch in length, 1/4 to 5/16 _____________ …

Run a 3 HP air compressor with a standard extension cord ... 
I am thinking about starting my own business up sandblasting & spraying' but need a portable compressor that will be able to give me not just the power …

Any idea why my air compressor motor not kicking in  
Med- Air electric 240v compressor. 1990 year. 24lt 8 bar Super little machine used in a framing wkshop. The motor wont kick in and I suspect a part …

Wattage needed for 3.5 HP air compressor 
i have a 3 1/2 horsepower 10 gallon tank and was wondering what size generator ill need to have it run properly ____________________ Darrell, according …

Typical electrical circuit for large air compressor ... 
large compressor loads. what are the elactrical aspects of starting in relation to power supply and detailed circuitry. _______________________ …

What wire and breaker to power my air compressor ... 
I have a new air compressor. It is 5 hp and 10 feet from the breaker box. I will use 220.I need to know the size of breaker to buy and what guage of wire. …

Where does the yellow wire go on my Speedaire air compressor ... 
IT TRY TO START BUT I NEED TO KNOW WHERE DOSE THE YELLOW WIRE AND THE WHITE WIRE GOS _________________ Bill says... Hard to answer this one, Ellis, …

Air compressor power problems in our plant 
hello, iam having a SUGUNA 5HP air compressor 3HP motor,250 tank capacity, in our place there is a lot of power problem,3 phase current is not supplying …

My air compressor cuts out every time I turn it on 
I think that there is electrical short somewhere with my compressors because it cuts off right after I turn it on and it shuts down the electricy of the …

Wiring a 5 HP air compressor motor ... 
About a 40 year old Quincy two stage. Previous owner said it ran fine. Should be a capacitor start, capacitor run motor (written on a cover plate.) Please, …

How many watts to run a 135 HP air compressor .. 
i have this s10 low rider that i want to hook a compressor to a tank i have juss wondering how much watts or enery or power it take to power that kind …

When I plug my air compressor in it will not run without help 
if i help the motor to go it will turn but otherwise nothing ______________________________ Bill says... Hi Ken. First check and see what …

Power demand of air compressor. 
what is the approximate power requirement for a screw compressor compressing 15 Nm3/min of air at 8 kg/cm2(g) pressure? screw compressor rating for …

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