Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
137 Troubleshooting
3.40 “U8” Malfunction of Transmission between Main and
Sub Remote Controllers
Remote
Controller
Display
U8
Applicable
Models
AII indoor unit models
Method of
Malfunction
Detection
In case of controlling with 2-remote controller, check the system using the microcomputer if
signal transmission between indoor unit and remote controller (main and sub) is normal.
Malfunction
Decision
Conditions
Normal transmission does not continue for specified period.
Supposed
Causes
 Malfunction of transmission between main and sub remote controller
 Connection between sub-remote controllers
 Defect of remote controller P.C.B.
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
SS1
of both remote controllers is
set to "SUB."
Set SS1 to "MAIN"; the
power supply off once and
then back on.
Set one remote controller to
"MAIN"; the power supply off
once and then back on.
Turn the power off and then
back on. If a malfunction
occurs, replace the remote
controller P.C.B.
YES
YES
YES
NO
NO
NO
Using 2-remote
controllers control.
SS1
of remote controller P.C.B.s
is set to "MAIN."