Service manual

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 86
3.2 “A1” Indoor Unit: P.C.B. Defect
Remote
Controller
Display
A1
Applicable
Models
All indoor unit 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 indoor unit P.C.B.
Troubleshooting
Turn power supply OFF, then
power ON again.
Does
the system return
to normal?
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector or parts could be damaged.
External factor other than
malfunction (for example,
noise etc.).
Replace the indoor unit
P. C . B .
NO