SiME332106E
Troubleshooting by Error Code
Part 6 Service Diagnosis
251
5.57 Check Operation Not Executed
Applicable
Models
All outdoor unit models
Error Code
U3
Method of Error
Detection
The check operation has not been executed.
Error Decision
Conditions
Error is decided when the unit starts operation without check operation.
Supposed
Causes
Check operation not executed
Troubleshooting
The contents of individual
failures vary with sub code.
Ensure the sub code, and
then go to the following:
Conduct the test operation.
(The test operation has not
been conducted.)
U3-03
Conduct the test operation.
(Test operation failed due
to indoor unit error.)
U3-02
Check for the refrigerant
piping, and then conduct
the test operation.
U3-04
Conduct the test operation
(due to the premature end
of the test operation).
U3-05
Conduct the test operation
(due to the premature end
of the test operation).
U3-06
Check for transmission
between indoor and
outdoor units, and then
conduct the test operation.
U3-07
Check for transmission
between indoor and
outdoor units, and then
conduct the test operation.
U3-08
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Conduct the refrigerant
auto charge operation.
(The refrigerant auto
charge operation has not
been conducted.)
U3-10
