Introduction The Daikin A5 error code is indicative of issues related to overheating or freezing of the indoor heat exchanger. This problem can be attributed to various factors, including a dirty air filter, a short circuit, or malfunctions with the sensor in the heat exchange system. In this article, we’ll explore practical steps to troubleshoot and resolve the Daikin A5 error, ensuring optimal performance of your HVAC system. Common Causes of Daikin A5 Error Dirty Air Filter: