Hisense AS-07UR4SYDDB15, Service Manual, Page: 54 / 59

80
6
x
Ο
x
AC voltage
higher or lower
protection
a.
the supply voltage is higher or
lower than normal;
b.
the inner supply voltage of the
unit is higher or lower than
normal
7
★ ★
x
Communicatio
n failure
between the
indoor unit and
outdoor unit
a.
the communication cable connect
loose;
b.
the communication cable is failure;
c.
the connection between the filter
board and the outdoor control board
is incorrect or loose;
d.
the connection between the filter
board and the terminal is incorrect or
loose;
e.
the indoor control board is failure;
f.
the PFC board is failure;
g.
the power board is failure;
h.
the outdoor control board is failure.
8
Current
overload
protection
a.
the fan motor run abnormally;
b.
the condensor and evaporator is
dirty;
c.
the air inlet and outlet is
abnormally
9
Maximum
current
protection
a.
the outdoor control board is short
circuit;
b.
the drive board is short circuit;
c.
the other components is short
circuit
10
★
x x
Communicatio
n trouble
between
outdoor unit
and driver
a.
the connection wires connect
loose
b.
the outdoor board or drive board
is failure;
11
Ο
x x
Outdoor
EEPROM in
trouble
a.
the EEPROM chip is loose;
b.
the EEPROM chip inserted with
opposite direction;
c.
the EEPROM chip is failure
12
Outdoor
ambient
temperature
too low
protection
Outdoor ambient temperature
too low
13
Ο
x ★
Compressor
exhaust
temperature
too high
protection
a.
the compressor exhaust
temperature sensor is failure;
b.
the refrigerant of the unit is not
enough