Troubleshooting by Indication on the Remote Controller ESIE09-05
166 Troubleshooting
3.2 “A1” AHU: PC Board Defect
Remote
Controller
Display
A1
Applicable
Models
All AHU models
Method of
Malfunction
Detection
Check data from E²PROM.
Malfunction
Decision
Conditions
When data could not be correctly received from the E²PROM
E²PROM : Type of nonvolatile memory. Maintains memory contents even when the power
supply is turned off.
Supposed
Causes
Defect of AHU PC board
Troubleshooting
Turn power supply OFF, then
power ON again.
Does
the system return
to normal?
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
External factor other than
malfunction (for example,
noise etc.).
Replace the AHU PC board.
(V2777)
NO
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