When you turn off the Sharp portable air conditioner and start it again without allowing three minutes to pass, the air conditioner's internal compressor might shut off after a moment as a safety measure, which will cause the unit to stop working. When an air conditioner (AC) starts and stops in quick cycles, and doesn’t run for long periods, this is known as short cycling. Yes, this is a very common situation. Shuts right back off. The fan on my Trane XL90 runs continuously even when the air conditioner shuts off. Home air conditioner starts but shuts within a few seconds with the inside fan running when the outside unit stops. When in Energy Saver mode, the unit will run until the desired room temperature is reached. Check the control panel to see if this mode is active. I had a repair man come out a month or 2 ago and he replaced the blower motor and capacitor. Tried various front … While this is a relatively common issue, it should not go unchecked. If the air conditioner is set to Energy Saver, this is likely the cause of the unit shutting on and off. The unit won't allow you to turn it back on until approximately five minutes have passed. Once that temperature has been reached, both the compressor and circulation fan will shut off. There’s a chance your thermostat is malfunctioning or doesn’t have enough dead-band hysteresis built into it, so it is touchy and reacts too quickly to the cooler temperature. “Short cycling" is the official term for when an AC turns on and off every few minutes. It is indicative of something being wrong with your air conditioner. Then it suddenly shuts off after just 5 seconds. A second sort of "short cycling" of the compressor also suggests that diagnosis and repair are needed: if an air conditioner or heat pump compressor runs for a very long time (i.e. We have a setback thermostat that is set to cool, fan on auto, and "run program". This then causes the air conditioner to overheat. Short cycling can cause issues like: Increased energy bills; Wear and tear on your system; Shortened AC lifespan; There are a few reasons that your AC can short cycle, but 4 of the most common are: An oversized AC system; A refrigerant leak; A dirty air filter This cooling cycle runs for a few minutes until the temperature is right; it then shuts down to save energy and prevent the air from getting too cold inside. All the lights on the front panel began flashing. Please find below the reasons why this might be happening Problem with the timer - Sometimes, the timer in your air conditioner may be defective. My ac unit turns on for a few seconds, then shuts off. Unplugging it and replugging it in does not solve the problem. A second sort of "short cycling" of the compressor also suggests that diagnosis and repair are needed: if an air conditioner or heat pump compressor runs for a very long time (i.e. The lights flash and the unit makes a beeping sound every 5 seconds when it is plugged in. This causes the AC to run longer to circulate enough cool air to achieve the temperature you want. I'm not sure if the actual outside unit kicks on, but I can hear the blower turn on inside. Change the filter and see if that helps. 1) Dirty air filter: Dirt on the filter impedes air flow. Fans draw air over the coil and force the air through the ducts that lead to the rooms in your house to lower the overall temperature. 2) Dirty condenser coils: The condenser coils are in your air conditioner… He … Could be a problem or could be normal.