MRCOOL systems are equipped with advanced self-diagnostic features that display error codes for quick identification and resolution of potential issues. Below is a detailed guide to all MRCOOL error codes and their corresponding troubleshooting solutions to help you keep your system running efficiently.. For other errors: The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a temperature reading.
Detail procedure to diagnose the E1 Error Code on Mr. Cool DIY 12K mini split air conditioner. And procedure to replace the indoor air handler control board..more. Troubleshooting An E1 Error Code One thing you can do to try and troubleshoot the E1 error code is power off the MRCOOL DIY mini split then wait two minutes and restart it.