Haier AB242ACBEA Service Manual page 94

2) The wire control organ displays the alarm signal with "E0"
"E0" means the floater switch of indoor unit is abnormal 
3) The wire control organ displays the alarm signal with "E1"
"E1" means indoor ambient temperature sensor is abnormal
Notation: The resistance of indoor ambient sensor is 23K
begining
the alarm signal of wire
control organ is E0
if the floater swith is
orientated correctly
Y
if the function of the
floater is normal
N
replacing the switch
Figure 7-4
begining
wire control organ displays
the alarm signal with E1
if the indoor ambient sensor
is orientated correctly
Y
if the resistance of
sensor is right
N
replacing the sensor
Figure 7-5
-53-
N
amend the oritation of
the floater switch
amend the
N
position of the
sensor