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Pressure switch contacts keep burning out.

Published Categorized as Uncategorized 18 Comments on Pressure switch contacts keep burning out.

by JB Johnson
(Sidney, Ohio)

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.

Newer Sanborn 5 HP air compressor
Newer Sanborn 5 HP air compressor

The switch will stick “ON” because the contacts will burn and weld together.


Compressor contacts keep burning out
by: Bill

What’s the supply amperage, distance from power source to compressor, and ratings for the pressure switch you are using, please?


Contacts burning
by: Doug in s.d.ca

Do you have a specific model number?

In addition to what Bill asks, you may want to check the motor capacitors – possibly one is failing, causing excess amperage.


Points sticking
by: Anonymous

How do you check the capacitor to see if it failing?


Testing capacitors
by: Bill

You go to the page on this website entitled testing capacitors!

It’s linked from the sitemap page and troubleshooting pages.

Let us know what you found if you would, please.

If you wish to learn how to adjust air compressor pressure switch control valve, visit our detailed page for more information!

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By Bill Wade

About Air Compressors has been helping folks with their Air Compressor Problems since 2002 online. We're a community of DIY and Compressed Air professionals who are keen to support everyone across the globe with their air compressor issues and troubleshooting. Whether you're trying to identify an old air compressor, or troubleshoot an error code on a sophisticated new industrial air compressor - the community at About-Air-Compressors.com is here to help you

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