Troubleshooting - Haier AB072MRERA Service Manual

26. Troubleshooting

Indoor failure diagnose
[08] Indoor drainage system failure/float switch circuit on indoor PCB failure
If CN13 is fixed well
If float switch works
If water pump works
[1/2/3/4/15] Indoor sensor failure
Yes
Yes
Yes
Check water pump
If sensor terminal is fixed well
Yes
If sensor resistor
/characteristic is proper
Yes
Check if PCB is faulty,
if yes, replace it
No
Reconnect
No
No
If CN4 is
with AC220V
voltage
Yes
No
No
If water
pump is electrified
Yes
Replace water pump
No
Reconnect
No
Replace sensor
634
Modify the wiring
and the circuit
Check indoor PCB and
replace it if necessary
Modify the wiring
and the circuit