If you notice a sudden change in temperature, you might need to get your air conditioner repaired. If you notice a change in the temperature of your establishment, you should get it fixed immediately. If the air conditioning unit shuts down suddenly, it could be a signal of a problem with its thermostat or control board. To check if this is the case, simply press the manual button on the thermostat. The compressor and fan will run and you can see if the issue is there.