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
The switch will stick “ON” because the contacts will burn and weld together.
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Compressor contacts keep burning out
What’s the supply amperage, distance from power source to compressor, and ratings for the pressure switch you are using, please?
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Contacts burning
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.
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Points sticking
How do you check the capacitor to see if it failing?
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Testing capacitors
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.
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