Haier H-MRV Series Service Manual page 177

9. Fault in built-in overload protection of compressor
Normally closed; open in the event of a fault.
Fault readout: 8; 8 flashes of ALARM light
Is CN14 in power supply
drive properly connected?
yes
Is overload protector
open-circuit?
yes
Is resistance of
compressor winding
acceptable?
yes
If compressor current and discharge
pressure are acceptable, the problem
is not related to refrigeration system.
Check if piping is clogged, ambient
temperature is high or heat
exchanger is soiled
10. Current transducer failure
Display 7, ALARM lamp flashes 7 times
check if the wiring is
correct according to
wiring diagram
yes
if compressor is
running?
yes
Is compressor current
acceptable? Is DC voltage
between both ends of CN4
acceptable?
yes
Check connection of mainboard
CN4 and make necessary
replacement
no
reconnect
Check power power
source board to see if
no
the 10th pin of CN13
has low level. If not,
replace it.
no
Replace compressor
no
reconnect
Is rectifier in good condition? Is AC
no
contactor activated? Is contact
good? Is power module in good
condition?
Is connection between
no
filter board CN1 and
mainboard CN4 normal?
yes
Replace filter
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no
reconnect
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