Midea RSJ-800/SZN1-H - E1: Power phase sequence error; E2: Communication error of host unit and wired controller, main unit and slave unit.

Midea R410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201906
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4.4 Troubleshooting
E1: Power phase sequence error
E2: Communication error of host unit and wired controller, main unit and slave unit.
E8: Error of circulating water flow detector (only host unit displays). The water flow switch is detected once then
circulate pump is on; E8 appears when water flow switch can’t be detected for 5s.
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