Haier 1U48IN1EAB, Service Manual

Page: 46 / 54

Single Split
44
no
no
no
yes
yes
yes
yes
Replace PCB
Is DC voltage between both
ends of sensor near 5V or 0V?
Replace sensor
Is sensor resistance acceptable?
Replace sensor
Is sensor short-circuit or open-circuit?
check if the wiring is correct
according to wiring diagram
no
reconnect
Relocate
if sensor is fixed well
re-wiring
yes
yes
yes
no
no
no
no
5) Communication error between indoor and outdoor units
Confirm commumication failure
according to the fault code list
re-wiring
change
defective parts
yes
Does indoor communication indicator flash?
Confirm the fault indicator is communication failure
Are communication wire S and supply wires L
and N properly connected? Grounded well?
if communication wire is broken
replace indoor PCB
if failure is eliminated
check if indoor/outdoor PCB fuse
and transformer are normal
replace outdoor PCB
no
yes
4) Sensor failure