Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506
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E3: Error of water outlet temperature sensor (T1).
E4: Error of water temperature sensor in the water tank (only host unit displays) (T5).
E5: Error of air heat-exchanger temperature sensor (T3).
E6: Error of outdoor ambient temperature sensor (T4)
E7: Error of E-heater pipe temperature sensor (T6, reserved).
E9: Error of suction temperature sensor (Th).
Ed: Error of water inlet temperature sensor (T7).
EA: Error of discharge temperature sensor (Tp).
EE: Error of EEprom