Troubleshooting by Indication on the Remote Controller
SiUS28-902_B
90
Service Diagnosis
3.2
PCB Abnormality
Remote
Controller
Display
A1
Applicable
Models
All indoor models
Method of Error
Detection
Check data from E²PROM.
Error 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
Defective indoor unit PCB
External factor (Noise etc.)
Troubleshooting
YES
Caution
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
the connector or parts may
b
e damaged.
T
u
rn the po
w
er s
u
pply OFF,
then the po
w
er O
N
again.
Does the
system ret
u
rn to
normal?
Replace the indoor
u
nit
PCB.
The indoor
u
nit PCB is
normal.
External factor other than
error (for example, noise
etc.).
N
O