ESIE09-05 Troubleshooting by Indication on the Remote Controller
Troubleshooting 165
3. Troubleshooting by Indication on the Remote
Controller
3.1 “A0” AHU: Error of External Protection Device
Remote
Controller
Display
A0
Applicable
Models
All AHU models
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Actuation of external protection device
Improper field set
Defect of AHU PC board
Troubleshooting
(V2776)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Indoor unit PC board replacement.
Actuation of external protection
device.
Change the second code No. to
"01" or "02" .
External
protection device is
connected to terminals T1
and T2 of the AHU terminal
block.
ON/OFF
input from
outside (mode No. 12,
first code No. 1) has been
set to external protection
device input (second
code No. 03)
by remote
controller.
YES
NO
NO
YES
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