SOURCE: My EC12 builds up pressure, but then releases all but about 10 psi.
The non-return valve is sticking and it's an easy fix. First, for safety, unplug the electric power to the unit and release any pressure in the tanks. Then unscrew the cap of the non-return valve (between the compressor and the tanks). Inside you should find a tapered rubber plug which is probably sticking in the valve housing. Sand down the diameter of the large end of the plug, being careful not to damage the flat face at the narrow end (which is the sealing surface). For sanding try 400 or 600 grade wet-or-dry paper and sand until the plug just moves freely in the housing. Reassemble and the compressor should work. Incidentally it's an oil-type unit, and quite durable. Make sure it has enough oil.
SOURCE: Over Pressure
I suggest trying to adjust the pressure switch, however, it is more likely that the pressure switch is bad and will need replaced. These can be purchased at most hardware stores or www.mcmaster.com. After you install it, you will need to readjust it to the pressure it was originally set to so as to not overpressurize the tank. Overpressure is very dangerous so do not use the compressor until it is repaired.
Best wishes!
SOURCE: Hitachi EC 12 Air Compressor does not keep pressure
to repair this problem (a) the pressure switch is not working,(b) check valve or non return valve sticking(stripe down repair and refit)
SOURCE: EC12 that fills fine, pressure switch kicks off, but then seems t
I have the same compressor with the same problem. I have temporarily eliminated the thermal reset with a piece of 12 gauge hard wire and it runs just fine. However, I do want to replace it before the warm weather come to the north. I tested the draw at 15.5 amps and the reset was a 17 amp. I am told by someone with superior electrical background that I need to install a 20 amp thermal reset in it's place. I have found that mine runs best when plugged directly into a 20 amp circuit and when using an extention cord I have a 10 guage cord that will carry the load needed to run the EC12.
Testimonial: "thanks ill give that a shot"
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