Room air conditioners draw a lot of electrical power, which can lead to less than optimum performance or even complete failure. If your room air conditioner doesn’t turn on:
1) Be sure the unit is plugged in and turned on.
2) Check that the outlet works by unplugging the air conditioner and plugging in a light that works (only for standard-voltage models—do not plug a light into a 220/240-volt receptacle).
3) If the light doesn’t go on, the circuit has probably overloaded—check the electric panel or fuse box and reset the breaker or replace the fuse.
4) If the light works, it’s likely that the air conditioner’s switch is faulty or the thermostat needs adjustment or repair.
5) Be sure the thermostat is set to “cool” and below room temperature.
6) Refer to the manufacturer’s instructions for thermostat repair. If adjusting or repairing the thermostat doesn’t solve the problem, unplug the unit and call an air conditioner technician.
