We have a new makita mac700, it was switched off and when it was switched back on it is working but not producing air. the air pressure is not increasing.

SOURCE: Makita MAC2200 runs fine (with new Manifold Switch

I have worked on many makita compressors and have run-across this problem on a few of them. Your compressor has a check valve that is supposed to hold tank pressure after the switch reaches set pressure. There is an unloader valve built into the pressure switch that releases the pressure in the discharge hose after the unit shuts off. The unloader allows the compressor to restart with-out any pressure in the discharge line. If the brass check valve is leaking pressure back into the system, air will leak out of the unloader valve. Follow the discharge line to the tank and you will see the brass check valve. To test valve for fault, run the compressor till it builds around 80 psi and unplug the unit from the wall outlet. Remove the 1/4" hose connector from the check valve and check for air leaking out of the valve. If it is leaking you can order form www.toolpartsdirect.com. or call the makita 1-800 number. The price is about the same. Good Luck on your repair.

SOURCE: Craftsman air compressor spitting sparks behind fan

If it is an oil type make sure it has oil. If it is the dry type you need a new compressor.

SOURCE: Makita MAC700 pressure switch won't power on?

Pressure switches do not have reset buttons built in. The reset button is usually attached to the frame or cover and marked with amp rating. The pressure switch only responds to pressure in the tank. There is however a switch incorporated in the cover or on one side of the switch. Usually a red button that you pull, red or black switch/knob/lever to turn on top or side. If on/off switch broke off in the off postion, the compressor will act as yours does. Try to find a picture of your switch on ebay using the brand name or shape /look and determine where the switch should be positioned. If the switch is broken or fallen off /lost, replace the pressure switch with generic. Usually about $18. Pay attention to port size, number of ports and pressure cut-out. Good luck