Sharp AE-X12PSR, Service Manual

Page: 46 / 73

SHARP(CHINA)INVESTMENT CO.,LTD
17. Display P7
Problem symptom
Display P7
Cause
Overheating protection under heating mode
n o i t c A s i s o n g a i d f o t n e t n o C . o N n o i t c n u f l a M
1
Check if the air inlet and outlet of outdoor unit is blocked by any
obstructions.
Install to the position as required in the Installation manual
and ensure the air inlet and outlet of the outdoor unit is
smooth.
2
Check the system for shortage of refrigerant. Add refrigerant
3
Check if the indoor exchange temperature thermistor is drifted,
short circuited or open circuited. (Measure the resistance of the
resistors on two ends of indoor temperature thermistor: (25 ć /
5k). For other resistances, please refer to the Temperature –
Resistance Sheet.
Replace the Indoor exchange temperature thermistor(IPT)
4
d r a o b l o r t n o c r o o d n i e h t e c a l p e R d e g a m a d d r a o b l o r t n o C
18. Display P8
Problem symptom
Display P8
Cause
Outdoor air temperature over/under protection
n o i t c A s i s o n g a i d f o t n e t n o C . o N n o i t c n u f l a M
1
The compressor cannot run under cooling mode when the
outdoor temperature is lower than -1 , or run ć under heating
mode when the outdoor temperature is higher than 33 , whilst ć
the compressor alarms P8 protection.
Normal protection function
2
If the temperature is not within the protective range above,
please refer to the Temperature – Resistance Sheet (See
Appendix). Use the multimeter to measure the resistors on the
two ends of outdoor intake temperature sensor (CN1)
(25 ć /5k). For other resistance, please refer to the
Temperature – Resistance Sheet.
Replace the sensor if it is incurred to drift, open circuiting
or short circuiting.
3 If the fault remains unsolved after replacement of the sensor Replace the outdoor power source board
19. Display P9
Problem symptom
Display E9 (Firstly display P0 or P9, then change to E9)
Cause
Intelligent power module of drive and module fault
n o i t c A s i s o n g a i d f o t n e t n o C . o N n o i t c n u f l a M
If this code is displayed when the compressor is
started for several seconds or even not started,
check the compressor connection for
correctness.
Replace the intelligent power module.(Be sure to apply
silicone when replacing the intelligent power module.).
Cooling/heating is normal
during run
Insert again if loose
P9 appears
after the air
conditioner is
started and
has run for a
period of time
If the cooling / heating are
abnormal, check the
compressor wiring for
correctness.
Insert again if loose
1
Re-energize
and check the
protection
code on
display.
Firstly display
P9
When the compressor is restarted immediately
after stop, this might also cause P9 protection
because the cooling system is not stable.
Try starting the air conditioner again after a longer
period of stop
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