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Start
Is there poor air return in the indoor unit?
Solve the problem
of system.
Malfunction is
eliminated .
Is the fan speed abnormal?
Solve the problem
of speed.
Malfunction is
eliminated .
Is the evaporator dirty ?
Clean the
evaporator
Problem is
solved.
End
no
yes
yes
no
System is normal, but the indoor tube
temperature sensor
is abnormal.
Replace the
temperature
sensor
Problem is
solved.
no
no
Replace the
controller
yes
yes
yes
yes
yes
yes
no
no
no
