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.R41
resistor 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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AU242FHBHA troubleshooting:
-164-
Summary of Contents for H-MRV AF092FCBHA
Page 121: ... _ VbTZR Zb _ UZdZ_ Vb AU242FHBHA PCB top layer printed diagram 121 ...
Page 122: ... _ VbTZR Zb _ UZdZ_ Vb AU242FHBHA PCB bottom layer printed diagram 122 ...
Page 127: ... _ VbTZR Zb _ UZdZ_ Vb AU482FIBHA high voltage PCB printed diagram 127 ...
Page 131: ... _ VbTZR Zb _ UZdZ_ Vb AU482FIBHA low voltage PCB printed diagram 131 ...
Page 152: ... a__WcU S c a V e a Wc AB092 182FCBHA PCB printed diagram 152 ...
Page 156: ... a__WcU S c a V e a Wc AE FCBKA PCB printed diagram 156 ...
Page 199: ...MEMO Commercial Air Conditioner ...