Hisense KFR-72LW Maintenance Manual page 36

Fault self-test code23
Compressor overheating fault
Compressor is very hot? yes
否
Compressor shell
temperature protection yes
switch is open-cruit?
and the resistance is smaller
no
The exhaust temperature
sensor resistance is no
normal?
yes
Outdoor control
board fault and
replace it
Fault self-test code27
No Load Failure
Compressor is running?
no
Is there voltage output
between IPM's UVW?
no
Is the voltage between P
and N of the IPM normal?
no
Outdoor filter substrate
failure and replace it
Fault self-test code28
Supply voltage abnormal
Is the power supply
voltage beyond the scope yes
of rated voltage?
no
Outdoor control
board fault and
replace it
Fault self-test code26
Over-current fault
Normal protection and The running current
automatically reply exceeded the range of
over a period of time rated current?
After turning off and
Temperature
restarting the air
protection switch is
conditioner again, it is
bad and replace it
After replacement of
Sensor fault and outdoor control board, the
replace it air conditioner is running
Outdoor filter substrate
failure and replace it
yes
yes Compressor Fault
IPM fault and
yes
replace it
Normal protection, the air
conditioner is running
normally after the voltage
returning to normal
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After turning off and
yes
conditioner again, it is
no
Accidental phenomenon,
yes
the air conditioner is normal
normal ?
no
Outdoor control board
yes
fault and replace it
properly?
no
After replacement of outdoor
control board, the air
conditioner is running properly?
no
Outdoor filter substrate
failure and replace it
Fault self-test code29
Outdoor instantaneous
power failure
Turn off air-conditioner
power supply, and restart
it after 3 minutes
Is the socket, power cord,
cables, main cable installation,
connection reliable?
yes
Can the air conditioner start
and the compressor operate?
否
After turning off and
restarting the air conditioner
again, it is normal ?
yes
Outdoor control board
fault and replace it
Normal protection and
restarting the air
yes automatically reply over
normal ?
Outdoor control board
yes
fault and replace it
Wire Failure and
no
reconnect the line
yes
是否还会出现故障
是
Supply voltage instability
no
and normal protection
a period of time
否