Has Pressure Switch Issues


Your compressor has pressure switch issues? Many times folks think that they have a pressure switch problem since air leaks out the pressure switch when the compressor is stopped. That is not a necessarily a pressure switch issue.

If that is the symptom you are trying to resolve, have a read of this page on leaking pressure switches for more details about what may be causing that problem.

A lot of folks have other compressor pressure switch problems and have sent in questions which I have tried to answer. Please see what others have written about their pressure switch problems and the answers provided at the bottom of this page.

Please do add your own question if you cannot find an answer in the existing comments below the form, or add advice to others about their pressure switch issues if you can. Then all can benefit from your compressor experience.

Thanks,

Bill

Ask What to do when your compressor has a pressure switch issue?

Please read the postings at the bottom of the page to see if it's already covered. If not, tell us about your problem.

Other pressure switch questions and comments...

Click below to see the problems others have had when their compressor has a pressure switch issue.

Iron Horse air compressor, Fenwai pressure switch rebuild 
When I this unit first started having a problem, I wasn't totally aware, this is because I'm confined to a wheelchair & often will have someone that is …

Pressure switch blows air out while running  
When building pressure the pressure switch has air blowing out of it when pressure is built up it stops what is wrong with my with my pressure switch.

Underload valve bleeds air 0psi then compressor kicks back on. 
It's an old compressor 4gal emgo compressor and when it hits 120psi the auto switch relay kicks off but hit the underload valve finger and releases all …

It runs for about 3 seconds and trips the breaker?  
Cuts on fine runs about 3 seconds and trips the electrical breaker. I give it a second, or 2 flip the breaker. It repeats the same process. Trouble shooting …

adjusting pressure switch - compressor has two switches 
How to adjust pressure switch on a compressor with two pressure switches?

On/off switch not switching on or off. 
I installed my new pressure switch successfully. Then I took off the cover and adjusted the pressure down. I put the cover back on and everything was …

Compressor will not cut in 
Compressor cut in has failed several times and the unit will not turn back on. The compressor is fairly new and has had this issue 3 or 4 times. It …

Pressure switch contacts keep burning out. 
I have a 5HP Sanborn air compressor that keeps failing the pressure switch every month or so. I am on my fourth in the last year. The switch will stick …

Plastic hose from pressure switch keeps blowing out 
When my compressor reaches about 80-90 PSI the plastic hose from the pressure switch blows out. If you look carefully at the photo you can see the plastic …

Is there a pressure switch check valve? 
Is the threaded pipe between the pressure switch and connects to the tank a check valve ?

pressure switch works for a few cycles and then quits 
pressure switch works for a few cycles and then quits. it will cut in at 80psi then cut out at 120psi for 5-10 cycles. thenit falls below cut in …

Condor MDR2/11 pressure switch leaking 
I have an older Fini Shuttle direct drive oil compressor. I am getting leaking air at (5) in the photo, which I think is the pressure relief valve. …

Cutout problem on Iron Horse compressor IHVP1520L ... 
I have an Iron Horse compressor - IHVP1520L. I've had the bottom end rebuilt do to a seizure (lack of oil). Since I've gotten it back, the Cut in works, …

Lefoo LF10-4H pressure switch unloader 
lefoo lf10-4h pressure switch. I know you said why would anybody want to set their unloader valve. Well I need to mine because I turned the screw thinking …

Shop air compressor won't turn on. 
The air tank is empty. Electric service to the compressor is verified good. The auto/off switch is in the auto position. I've noticed the auto/off …

Compressor pressure switch adjustment ... 
I can't find a pressure switch that is pre-set to the manufacturers high/low setting on an older compressor I have. I use 2 compressors in series with …

both contacts in the pressure keeps burning out 
My pressure switch contacts keep burning out and my electrician keeps replacing it . What is causing that to happen? _____________________ Bill …

The pressure switch does not kick off on my air compressor ... 
The pressure switch does not kick off when the compressor has reached its maximum pressure. The contacts weld together. The switch was burnt up and was …

Compressor Pressure switch adjustment 
I run a mobile service. my compressor holds 120 lbs. when it drops to 90 it kicks back on. I want it to drop to 50 lbs before it kicks on. how do i adjust …

Have replaced air compressor pressure switch but still compressor doesn't work 
Compressor will not shut off. Replaced pressure switch with new one ($75.00) and still wont' shut off automatically, when shut off manually and then flipped …

Compressor over pressurise 
compressor sits humming and trying to turn the motor instead of cutting out. It is a Ferm nail gun compressor. ______________________ Bill says... …

After my tank reaches max. psi the motor shuts off but air leaks out? 
I have a 3 piston compressor 150 psi max. The compressor builds pressure to 150 than the motor shuts off normal. But when the switch turns off the motor …

Broken compressor pressure switch... 
for husky m#h27508uwk year manf 2004 Bill says... Hey Michael. Many pressure switches have the schematic for that switch stencilled under …

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How to adjust the compressor pressure switch down ... 
I have a Dewalt D55168, 200 PSI 1.8 HP 15 Gallon tank I picked up used the other day. Everything seems to run just fine except it hasn't cut off on it's …

My air compressor does not shut off at 125 PSI like it should 
It should start at 90psi and shut down at 125psi. It just continues to run and I do not know why?? When I mess with the switch from off to auto it did …

When compressor reaches max pressure the breaker pops ... 
Compressor run's an builds up pressure then when max pressure is built up instead of stopping it blow's circuit breaker in house My compressor I start …

The pressure switch does not kick off at the maximum pressure ... 
I put a new pressure switch on my compressor, it still goes past the max pressure. so i have to switch the breaker off. when it does eventually shut off …

Compressor pressure switch control... 
I recently bought a house with a 2 car garage/shop. The upright compressor had been functioning normally ( as far as I knew)because I had used it prior …

Vintage Pelton air compressor pressure switch ... 
I have a vintage pelton air compressor. made in detroit. horizontal tank 10" dia 19" long. single stage powered by 1/4 hp ge motor the square d pressure …

Can I run two legs of my 3 phase power through my pressure switch ... 
Hi Bill, You helped me with my check valve question and I am hoping that you can help me with my pressure switch question. I forgot to order a Mag …

Compressor pumps up and blows all air out ... 
pumps up and blows it all out not out the prv out of the housing put on new housing still blows out ____________________ Bill says... Harry, …

Power Craft air compressor will not go higher than 30 PSI ... 
Hello, I have a small power craft 13 gal air compressor that has worked perfect for three years until one day the air pressure wouldn't go higher than …

Compressor automatically empties when i turn it off 
I spotted a leak on one on the joints yesterday so i fixed it with thread tape. When i started it up to check the joint, it got up to pressure ok but when …

Compressor runs until the relief valve pops 
My work compressor runs until it pops the relief valve on the unit. How do you adjust the pressure switch? there are 2 springs with a nut on each, 1 tall, …

Pressure going too high on my air compressor and PRV blows ... 
The compressor is exceeding the required PSI then blowing the relief valve. __________________ Bill says.... Scott, the likely cause is that your …

Air compressor is short cycling ... 
willnot run long enough to build any pressure _______________________ Bill says.... Pull the plug, James. Drain the tank to zero. Put a multi-meter …

Compressor trips out the reset on the control box 
When the compressor in our mechanical shop is used for a period of time it will trip out the reset button on the control box that is mounted on the wall …

Hook up pressure switch for air compressor ... 
have 240 for compressor but need hook up for regulator to shut off compressor _____________________ Bill says... Hello Robert. If what you refer …

Air compressor pressure switch failure 
I have an old, about 20 year old, Ingersoll-rand T21. Its like pulling teeth trying to find the pressure shut off switch for this old girl. The compressor …

Pressure builds to 30 psi then motor acts like it does not have enough juice 
i have a 230 volt 60 gal and when i turn it on it builds to 30 psi and the motor shuts off and will not start . it is hooked to 8-2 wire on a 30 amp breaker, …

Troubleshooting 
I have Honda Rol-Air Compressor with 8hp Honda GX40 Max Engine. The Engine runs fine when run with the manual throttle control. But when I throw tab …

Compressor stops before reaching cut out pressure... 
I got a Porter Cable C2000-WK-1 air compressor that stops at around 145psi instead of the 150 that it was designed to stop at. Then the pressure reading …

Compressor cuts on and off and no pressure... 
My compressor cuts on and off with no pressure for the air pressure to work.I have a paasche d500. _______________________ Bill says... Hi Lisa. …

Air compressor will not stop building pressure... 
I have a Jenny dual tank will barrow type compressor. It pump pressure fine but just dosn't stop building pressure. I change the pressure regulator but …

Compressor pressure switch overloading air compressor motor 
My Cambell Hausfeld 2 HP air compressor is set to go off at 180 psi. But as the air builds up to 100 psi the motor starts slowing down and the belt …

How a pressure switch with single function works? 
we are about to buy a pressure switch, but the problem we don't know what will be more suitable a double function or single function. Bill says... …

Pressure switch and unloader valves... 
I have a speedaire ml. #5z645c and after it pumps up to pressure it has developed a leak just under under the on off switch. Once the tank pressure …

Compressor not building air - is it the pressure switch ... 
I have an oiless campbell hausfeld wl611106 compressor 5.5 hp. My problem is When I turn on the compressor at the first of the day it will pump up …

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