>a__WcU[S^ <[c >a`V[e[a`Wc
no
no
yes
yes
Check power power
source board to see if
the 10th pin of CN13
has low level. If not,
replace it.
Replace compressor
reconnect
Is CN14 in power supply
drive properly connected?
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
Is resistance of
compressor winding
acceptable?
Is overload protector
open-circuit?
yes
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
no
no
no
no
yes
yes
yes
Is connection between
filter board CN1 and
mainboard CN4 normal?
reconnect
Check connection of mainboard
CN4 and make necessary
replacement
Is compressor current
acceptable? Is DC voltage
between both ends of CN4
acceptable?
if compressor is
running?
check if the wiring is
correct according to
wiring diagram
yes
Is rectifier in good condition? Is AC
contactor activated? Is contact
good? Is power module in good
condition?
no
10. Current transducer failure
Display 7, ALARM lamp flashes 7 times
reconnect
Replace filter
-177-
Summary of Contents for H-MRV AF092FCBHA
Page 121: ... _ VbTZR Zb _ UZdZ_ Vb AU242FHBHA PCB top layer printed diagram 121 ...
Page 122: ... _ VbTZR Zb _ UZdZ_ Vb AU242FHBHA PCB bottom layer printed diagram 122 ...
Page 127: ... _ VbTZR Zb _ UZdZ_ Vb AU482FIBHA high voltage PCB printed diagram 127 ...
Page 131: ... _ VbTZR Zb _ UZdZ_ Vb AU482FIBHA low voltage PCB printed diagram 131 ...
Page 152: ... a__WcU S c a V e a Wc AB092 182FCBHA PCB printed diagram 152 ...
Page 156: ... a__WcU S c a V e a Wc AE FCBKA PCB printed diagram 156 ...
Page 199: ...MEMO Commercial Air Conditioner ...