Mr Cool E1 Error Code diagnosis and fix

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.
Mr. Cool video about E1 Error Code: • E1 Error Code (EL 01 4...
How to measure Vs: • Troubleshooting an E1 ...
Mr. Cool video on replacing the air handler board: • How to Change a MRCOOL...