Sharp AE-X12PSR, Service Manual

Page: 42 / 73

SHARP(CHINA)INVESTMENT CO.,LTD
6. Display EU
Problem symptom Display EU
Cause Voltage sensor fault
Malfunction No. Content of diagnosis Action
Insert again if loose. 1 The outdoor power source bord can’t check the
voltage, check the votage lower or higher than the
protector voltage .
Replace the outdoor power source board
voltage sampling circuit
7. Display EP
Problem symptom Display EP
Cause Temperature switch fault ( on top of the compressor)
Malfunction No. Content of diagnosis Action
Check the insert position CN3 of the compressor
top temperature switch wires on outdoor power
source board
Insert again if loose. 1
No switch on compressor top Jumper short-circuiting (This function not provided for 1 – 1.5P unit)
Check the U, V and W wires of
the compressor.
The correct sequence of U. V and W wiring shall be “red, white and
blue”. Connect again if incorrect.
Check the system pressure. The pressure is low. Add refrigerant to ensure the system pressure
is normal.
2 Compressor
temperature. The
temperature is
very high,
accompanied
with bad smell.
Check the outdoor ventilation
and if there is any obstruction
that affects the normal radiating
of the air conditioner.
Install to the position as required in the Installation Manual and
ensure the air inlet and outlet of the outdoor unit is smooth.
If the fault is solved after short circuiting, replace the shell
temperature switch.
3 Compressor temperature: The temperature is not
high. Short circuit CN3.
If the fault remains unsolved after replacing the shell temperature
switch, please replace the outdoor power source board.
8. Display P1
Problem symptom Display P1
Cause Overvoltage / undervoltage protection
Malfunction No. Content of diagnosis Action
1 Test the supply voltage if it is between 160V
̚
260V
˄
AC
˅
.
It is normal protection if exceeding this range.
2
Test if the voltage between L and N terminal of
outdoor unit is within 160V
̚
260V
˄
AC
˅
.
It is normal protection if exceeding this range.
3 If the voltage is normal: Replace the outdoor power source board
3-14
3-14