Our Hitachi EC119Sa will not start if the temp is lower than 60. It also kicks out the restart button

Question edited for full 'make model (what is is)', plus 'Hitachi'!
Question moved from Televisions category to the correct one.

I thought there may be a video, but there isn't. There is a previous Fixya question and other help in the link though.

https://www.google.com/search?q=hitachi+ec119sa+replace+regulator+knob

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Hitachi EC119SA 15 Amp 2 5 HP Lon Twin Stack Air Compressor Instruction...

here is a link to maintenance for these good luck

Hitachi EC119SA 15 Amp 2 5 HP Lon Twin Stack Air Compressor Instruction...

The pressure regulator can easily be replaced by removing the large plastic decorative cover. The manifold behind the cover is the part where the regulator , gauges, and quick connects are attached. The manifold is fed air from the pump via a plastic hose connected to the pressure switch. The regulator sells for about fifty dollars. This part usually fails in two ways. It leaks air from the knob or no air pressure will reach the quick connects. If your problem is no air at the quick connect, you can do a temp repair by removing the safety valve and installing a tee fitting at the port. On the tee fitting reinstall the safety valve and a quick connect on the other fitting. This will give you tank pressure . Good luck.

I would bypass the thermal safety and test the unit. Does it go to proper pressure? run it through two cycles. If it looks good, reconnect the temp sensor and use it until a new one can be obtained.

Hi, my name is John. Welcome to FixYa. Check your pressure switch, it,s only supposed to build up to 135 psi and shut off, then back on when the pressure gets below 105 psi, check the oil level. thanks for choosing FixYa. ..John

The relief valve is not working,this valve relieves pressure from the head,or the one way check valve is bad.

Here is a link for an online supplier who sells parts for those

http://www.mastertoolrepair.com/ec119sa-p-7715.html

The regulator is marked as a "pressure reducer" (0030) and is $44.80 on that site. Good luck.

You stated that the compressor started up fine. I'll assume it reached it's max psi then cut out. Then upon reaching it's cut-in psi the motor ran slowly for a few seconds, then kicked off. I also assume you mean check valve when you refer to the non return valve.
If this sounds about right then. The first thing I would do is bleed out all the air from both the tank and the pump supply line leading from the pump head to the tank's check valve. You can do this by simply loosening the fitting that attaches the line at the head or the check valve. Once done try running the compressor again.
The purpose of this is to check the unloader valve. This valve bleeds off the pressure that remains in the compression cylinder and the supply line up to the check valve. When functioning normaly it will bleed off this pressure once the motor shuts off. If it is not working correctly then when your compressor starts back up (once it is already been filled) the piston will be working against a psi close to the max psi.

If the problem reoccurs only after the compressor has reached it's max psi, then the unloader valve is most likely the problem. If however it will not start up at all even after a complete bleed then it has to be something internal to the pump and\or motor.

Please try this and let me know (or repost) your findings.
If it's the unloader valve I should be able to explain how to repair this valve.
Good luck.

Push the red and white buttons at the same time for about 3 seconds-the temp will start to flash-then press the white button to lower the set temp-when you have it where you want it then push the set buttom