Midea PTAC Series Service Manual page 9

Error codes:
AS- Open or short circuit of room temperature sensor (T1);
ES- Open or short circuit of evaporator temperature sensor( T2 );
CS-Open or short circuit of condenser temperature sensor (T3);
oS-Open or short circuit of outside temperature sensor(T4);
HS- Open or short circuit of exhaust temperature sensor( T5 or T6);
Other codes:
LO-Room temperature is lower than 0℃/32℉;
HI-Room temperature is higher than 37℃/99℉
E4- Communication malfunction between main control board and display board
LE- Drive-by-wire controller failure
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