Midea CSU-05HCAA Installation And Maintenance Manual page 102

display at
off state
display at flicker 7/9
E7
off state
display at flicker 8/10
E8
off state
SEC at off
state
display
at off
SEC
state
display
at off protection/over
SEC
state heat protection
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signal normal.
2、Check whether the signal outputting from
the integrated chip of the electric control
board is normal, the electric control board
should be replaced when the signal is
abnormal.
1、 Check whether the winding resistance and
operation current of the compressor are
normal
2、Check whether the high and low pressure
is normal when the unit is running.
3、Check whether the indoor and outdoor
wiring is right; when it is wrong, connect
them again according to the circuit
diagram
outdoor
4、 Check whether the contact of the
feedback fault
inserter on the circuit board and the
connection are well, otherwise repair.
5、Check whether the signal feedback wire is
disconnected, replace or connect the
feedback signal wire.
6、Check whether the supply power is
phase-lacking or phase opposition.
7、Check whether the AC electromagnetic
contactor is well.
1、Check whether the filter of the indoor unit
is dirty or blocked, and clean if it is dirty.
2、Check whether the indoor fan is running
normally, and replace the motor if it is
abnormal.
frost
3、Check whether indoor pipe temperature
sensor is normal, and replace the sensor
if it is abnormal.
4、Check whether the system pressure is
normal,
whether there is leakage, and fill the
refrigerant again.
if abnormal, should check