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Their are two (2) lines coming out of the back side of the pump, one of them will have a hose type clamp on it and be a bit big around than the other, that one is NOT the high pressure line. it is the return line.
Usually, hot air indicates leaking valves or gasket within the pump or overworking (duty cycle). Most likely parts are not available but would be interesting to open the pump and examine parts. May just need cleaning/removing or carbon deposits, cracked reed valve or worn seat. Easy to repair. Remove the head very carefully marking all parts for easy re-install. Make gaskets using auto style gasket material of same thickness. Make any broken reed valves out of feeler gauge material of similar thickness. Any compressor can be made to work tankless but why not have a tank to store a bit of extra air and allow the air to cool a bit and drop out the water into the tank rather than just push it straight thru to the sprayer. Tankless compressor are mostly used for sprayguns or other tools that allow the air to pass thru so that the compressor will not load and heat up. That could be one reason that your compessor is getting hot. You spraygun should be allowing the extra air to pass thru and not load the compressor. Try adjusting the pressure setting on the compressor to the lowest setting allowing most of the air to bypass, then slowly turn up the pressure till spray gun just works as needed. If you are allowing the compressor to work at full pressure and only using say 25psi to paint, you are wasteing energy because the compressor cannot rest. On a tank type compressor, the compressor will rest when shut off pressure is reached. You can paint with tank or tankless, should be no difference, depends more on the spraygun. Good luck
if it is a split system that is permanently installed in your house the reset button will always be near the compressor so that means on the outside unit somewhere, you probably wont need to remove any screws to get to it. but before you press that button and think all is well, why did the reset button trip? answer> because it is a high pressure cut off. your unit probably reached over 350psi on the high side line or possibly even higher. that is not good. you may have a dirty condenser coil (outside) and you can just hose that out with a garden hose (pull the disconnect first). or you may have a rotting out coil if your unit is old or you live less than 5 miles from the ocean. Or you may have a bad condenser (outside) fan motor. check that out. if it overloads again after hitting the reset (which this unit may not even have, not all units have these just the higher end ones) well if it does overload again call a licensed ac guy trust me it will cost you less in the long run.
If the motor runs continuously, rather than pulsing on and off, then this points to a major leak rather than a simple seal failure. If there's any possibility that the machine has been subject to frost, then part of the high pressure system may be split. This is not as bad as it sounds, as even replacing the whole cylinder head and control head assembly is not unduly expensive.
Having said that, I have seen one machine recently with this problem where the only thing wrong with it was that a joint between the pump head and the high pressure hose connector had simply come apart (shouldn't be possible, but it had).
If you need more help, please post again with details of the model number.
pressure washers has this pressure switches where in as you press on the trigger, the washer works and if you release it, the pressure would build up high and it would trip this switch to turn off the motor or deflect the water to the by pass hose ( if the motor is not stopping) then as you press again the trigger, water should come out of the gun again but would not,
i have encountered the problem is in the pressure switch, even the pressure went down, sometimes it wont close the contact then the motor wont run ,
if the motor is continously running, then the trigger switch is the problem, the pressure excerted on the switch is so high that even if you press it , it won't open up to release the water.
what i can suggest is to tie the trigger in the gun so that it is always pressed and then just unplug the unit if you want to stop using it. it is an inconvenience but it will work.
or, open the gun and see if you can figure out why pressing the trigger would not open the switch.
another option is you can lower the pressure of the washer if it has an adjustable pessure controller. by lowering the pressure might open the switch when ever you press the trigger.