Reconnect
Reset address
no
yes
Wired controller: E9; 4 flashes of TIMER lamp
1.Communication failure between indoor and outdoor units
Is indoor unit address
properly set? Without
repetition?
no
no
no
yes
yes
Are communication terminals of
indoor and outdoor units
securely connected?
Is shielded wire
used for
communication?
Use shielded wire. Shield layer
should be grounded at single
point
Are communication wire
and power cable set
separately?
wiring Separately
yes
yes
yes
Is there external signal
interference?
Eliminate interference
Is indoor mainboard poorly
welded?
no
no
no
yes
Replace indoor PCB
Are communication resistance and
capacitor of indoor PCB correct? See
NOTE
Replace indoor PCB
Check outdoor mainboard
0010450351. Make necessary
replacement
NOTE: 1. R49.R50 resistor in AS072-182FCBHA circuit and R40.R41resistor in AE072-242FCBKA
circuit have a resistance of 100 K instead of 47K
. AS models and C28~C30 of AE models use 104
polyester resistors.
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AU482FIBHA troubleshooting:
-171-
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