Compressor starts then stops after maybe 3 mins

sounds like compressor is over heating, may be dirty around it reducing cooling air or it could be the compressor is going bad

High limit switch set to high, obstruction in the system, or your compressor may be wearing out.

Dirty coil wash outside unit with water and change indoor unit filter

Hello

Sounds like the compressor is shuting down on high heat.There could be a couple reasons for this.
1 Check that proper voltage is being supplied to compressor.
2 Freon level may be low.This would be a service call.
3 Bad or intermitent connection at thermostat.
4 Main contacts to compressor sticking,usually burnt or pitted.

i hanve 1.5 ton window air condtioner.compressor of a.c runs for 2 min and he it cuts off after 3 min it again starts

start with having the pressures checked, sounds like your compressor is cycling off due to low pressures...

The start capacitor may be the problem. Is your AC a central unit or window unit? Whats the model and make? If a window unit it could also be the thermostat is defective or too close to evaporator fins. Dirt on the condenser outside can cause the motor to heat up to the point it shuts down to cool the internal overload. Let me Know, Sea Breeze

how many amp service do you have in the house

send it back again!

Have someone check the run capacitor of this unit. If the run capacitor is bad over shorted it can cause the unit to run and short cycle on a current overdraw. This makes for an electrical imbalance in the compressor motor. Next step is the compressor is faulty.