Service manual

31
the key is to check the evaporator temperature
detected by the coil pipe temperature sensor has
reached the cooling or heating temperature.
4、Check whether the surface of the condenser is too
dirty, it should be cleaned when it is too dirty.
5、Check whether the capacitance of the outdoor motor
and the fan is damaged, it should be replaced when
it is damaged.
6、If the above items are normal, the electric control
board should be replaced.
E5
PG motor
display at
off state
flicker 5/7
SEC
display at
off state
no feedback
signal of indoor
fan
1、Check whether two sets of plugs on the outlet end of
the motor have loosed from the socket of the
electric control board, insert it firmly when loosing.
2、Check whether the indoor motor has damaged, the
motor should be replaced when it is damaged
3、 Check whether the controllable silicon and other
components on the electric control board have
damaged, replace the controllable silicon or electric
control board when they are damaged.
E6
PG motor
display at
off state
flicker 6/8
SEC
display at
off state
no over zero
signal
1、Firstly check whether the indoor fan is 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.
E7
display at
off state
flicker 7/9
SEC
display at
off state
outdoor
feedback fault
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
4、 Check whether the contact of the inserter on the
circuit board and the connection are well, otherwise
repair.
5、Check whether the signal feedback wire is