I’ve received a number of questions on my ASK page wondering what’s wrong with a compressor that it won’t shut off. Further to that, one writer indicates that the PRV (pressure relief valve) pops every time he uses his compressor.
If your compressor won’t shut off, you are flirting with a very dangerous situation. The compressor will keep compressing air into the tank until:
a)it can’t compress any more because there’s more pressure in the tank than the compressor head can overcome
b)the pressure relief valve opens to safely vent tank overpressure
c)neither of the two above happen, and your compressor tanks undergoes catastrophic failure, with significant risk to all and sundry around
We hope that the PRV works.
Regardless, if the compressor won’t shut off, you need a new pressure switch RIGHT NOW. Don’t delay. Your compressor is in trouble, and so could you be if you don’t replace the switch. Here’s one source. But regardless of where you get one, get your pressure switch replaced.