Generally, it’s normal if your air conditioner keeps running when turned off. However, it will be a severe problem if the air conditioner continues to work for more than ten minutes or even more than an hour. To find out why your AC is off but the fan is still running, let’s check the article below for further information.
Why Does the Fan Keep Running on My Air Conditioner?
Many reasons can cause an AC unit to run when turned off. Most of them come from the tools of the air conditioner.
The Electronic Control Board (PCB Assembly)
The electronic control board refers to the brain of the air conditioner. It has a function to receive and relay any components from the air conditioner. The defect on this control board can cause the air conditioner keeps running when turned off. If your electronic control board is broken, it will be better to get a new one.
Thermostats or temperature controls are small tools that have the function of controlling the air temperature. Relay switches are common for air conditioners that use rotary dial temperature control. Your air conditioner will keep running even though it is off when it happens.
Technically, the dials always meet to complete the area and turn on the compressor, especially when the temperature is high. However, if the dials misfire, the compressor will continue to work and some AC units running when turned off.
Thermistor (Temperature Sensor)
Overall, the thermistor and thermostat are two components that work together in sensing the temperature. Using the window unit air conditioner, you can find a small light beside the evaporator. The thermostat also has a time desk, like the thermostat. It decides when the condenser should be off or on.
The damage to the thermistor can also cause your AC to be off, but the fan is still running. Please open your air conditioning unit to check if your thermostat is in good condition. After that, look if the sensor is broken or disconnected. When using this approach, do not forget to use a multimeter to investigate the other components of your air conditioner. It will help you to find the source of the damage effectively.
Inefficient (Undersized) Air Conditioner
Unlike the other reasons, this last point is a technical issue due to the air conditioner keeps running when turned off. That is why you need to choose your air conditioner carefully before buying it. Check the size and suitability of the air conditioner for your room.
You have to know that an undersized air conditioner refers to installing an air conditioner in a big room. Therefore, it is difficult for your air conditioner to cool down the room temperature. Finally, this condition will push your air conditioner to run continuously. We suggest you get a larger or more powerful air conditioner soon.
The air conditioner keeps running when turned off for a long time is a very disturbing and upsetting situation. If this happens to you, find an expert to fix it. It’s better than handling it on your own.
AirconMag is an experienced author and Air Conditioner expert. With years of practical experience in the field authored several informative articles on various aspects of AC unit, including installation, maintenance, and repair