Failure Analysis And Checking Flowcharts - Hisense KFR-72LW Maintenance Manual

8.4 Failure Analysis Process:
Fault self-test code: 3
Evaporator freezing
Evaporator freezing?
yes
Compressor stop?
no
Turn off the power and open
air-conditioners after
defrosting on the evaporato
Continue to freeze?
yes
Turn off power, and open air-
conditioners after replacing
the outdoor control board
Air-conditioner is
normal?
no
Indoor control board fault and
replace it
Evaporation
no temperature sensor
fault
Normal protection
yes
action
r
Unexpected
no
phenomenon
Outdoor control board
yes
fault
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Fault self-test code: 4
Evaporation overload
evaporator with high-
temperature?
yes
Compressor stop?
no
Turn off the power and open
air-conditioners after 10
minutes
Air-conditioner is
normal?
no
Turn off power, and open air-
conditioners after replacing
the outdoor control board
Air-conditioner is
normal?
no
Indoor control board fault and
replace it
Evaporation
no temperature sensor
fault
Normal protection
yes
action
Unexpected
yes
phenomenon
Outdoor control board
yes
fault