Service manual

30
on state
SEC
indication
display at
off state
flicker 1/3
SEC
anti cold wind
1、 Normal (during heating mode )
2、It will be removed when the coil pipe temperature
sensor reaches certain temperature.
E2
display at
off state
flicker 1/1
SEC
display at
on/off
state
room temp.
sensor fault
1、Check whether the resistance of the sensor is normal
(the resistance is 5КΩ in the normal temperature
25℃), when it is abnormal the sensor should be
replaced.
2、Check whether there is short circuit or open circuit in
the wire of the sensor, and whether the plug is
connected well, whether there is welding off or
rosin joint on the electric control board, if there is
any, it should be repaired.
3、When the 1 and 2 are both normal, then the
components or integrated circuit is damaged, the
electric control board should be replaced.
E3
display at
off state
flicker 3/5
SEC
display at
on/off
state
coil temp.
sensor fault
1、Check whether the resistance of the sensor is normal
(the resistance is 5КΩ in the normal temperature
25℃), when it is abnormal the sensor should be
replaced.
2、Check whether there is short circuit or open circuit in
the wire of the sensor, and whether the plug is
connected well, whether there is welding off or
rosin joint on the electric control board, if there is
any, it should be repaired.
3、 When the 1 and 2 are both normal, then the
components or integrated circuit is damaged, the
electric control board should be replaced.
E4
display at
on/off state
flicker 4/6
SEC
display at
off state
outdoor unit
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 coil pipe sensor is normal)
whether the contact of the inserter on the circuit
board is well, the coil pipe temperature sensor is
fixed, the evaporation of the indoor unit is well,