DeVilbiss Air Compressor Troubleshooting


DeVilbiss, now DV Systems, began production of air compressors in 1954, and its products are distributed worldwide. These are sturdy units, and DV Systems offers a seven-year pump warranty on its heavy-duty industrial air compressors. If problems occur with your system, check for clogged air intake filters, defective pressure switches, and air hose leaks, among other problems. Run through a basic troubleshooting list before calling a DeVilbiss technician for service.

Things You'll Need

  • Fusetron type T fuse
  • Clean the air intake filter if the compressor is not supplying enough air to run tools or accessories. Pull the air filter out of the unit and wash it with a mild detergent and soapy water. Replace the filter if necessary. Do not operate the compressor with the filter removed. Inspect the hose for leaks, and replace it if necessary.

  • Move the pressure switch to the "Off" position if the air compressor does not automatically shut off when the unit reaches capacity. The safety valve could pop off if there is excessive pressure in the tank. If turning the pressure switch off does not shut down the compressor, unplug the unit at the electrical outlet. If the electrical contacts have become welded together, have a service technician replace the pressure switch.

  • Tighten the fittings if you hear air escaping. Check for leaks by rubbing a solution of soapy water over the fittings. Do not overtighten the fittings, which could strip the threads.

  • Allow the motor to cool, if it will not run or restart. The motor overload protection switch might have been tripped. The switch will reset automatically after the motor cools sufficiently. Check to see that the wiring connections inside the pressure switch and terminal box are secure and free of damage or burning.

  • Check the fuse box for blown fuses or tripped breakers if the unit will not run at all. Reset the breakers as necessary. Do not install a breaker or fuse with a higher rating than specified for your particular branch circuit. DeVilbiss says to use only a "Fusetron" type T fuse.

  • Push the lever on the pressure switch to the "Off" position to bleed the line if the pressure-release valve on the pressure switch does not unload the head pressure. Replace the valve if it does not open.

  • Replace the regulator if the regulator knob has a continuous air leak.

  • Fully drain condensed water from the tank to prevent rusting and thinning of the steel tank. This could lead to the tank bursting.

Tips & Warnings

  • Do not drill, weld, or modify the air tank in any way. That could lead to an explosion.

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  • Photo Credit people at work, air compressor image by Greg Pickens from
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