Haier AU96NFTAHA Service Manual page 64

(3) Sequence of judgment
[04] Serial communication circuit of I/F interface PCB and INV PCB, TRS temperature switch circuit.
Check I/F PCB
whether there is serial signal sending to
the INV PCB
Check I/F PCB
whether there is continuous signal coming
from the INV PCB
Check the condition of power interferenceand extraneous noise
[0b] Drain pump system of condensed water (float switch circuit of indoor PCB)
Whether the
connection of CN connector
is normal
Whether the float switch act
Whether the
drain pump water acts
Check drain pump
Yes
Yes
Yes
Yes
Yes
drain pump of is switched on
Replace the drain pump.
No
Check outdoor I/F PCB
No
Check outdoor INV PCB, TRS
No
Modify the connection
No
Whether the
pin 5-7 in CN10 has
AC220V voltage
Yes
No
Whether the
power
Yes
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No
Modify wire andwiring loop
Check indoor PCB, ifimproper, replace
No
C h e c k t h e l o o p , modify the circuit