Haier AE142FCBKA [108/126] Commercial air conditione

Haier AU48NFIBJA [108/126] Commercial air conditione

Commercial Air Conditioner Model: AU242FHBIA,

AU482FIBIA, AU48NFIBJA

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

-108-

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