SiAF341904E
Troubleshooting by Error Code
Part 6 Service Diagnosis
265
5.50 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 indi
v
id
u
al
fail
u
res
v
ary
w
ith s
ub
code.
Ens
u
re the s
ub
code, and
then go to the follo
w
ing:
Cond
u
ct the test operation.
(The test operation has not
b
een cond
u
cted.)
U3-03
Cond
u
ct the test operation.
(Test operation failed d
u
e
to indoor
u
nit error.)
U3-02
Check for the refrigerant
piping, and then cond
u
ct
the test operation.
U3-04
Cond
u
ct the test operation
(d
u
e to the premat
u
re end
of the test operation).
U3-05
Cond
u
ct the test operation
(d
u
e to the premat
u
re end
of the test operation).
U3-06
Check for transmission
b
et
w
een indoor and
o
u
tdoor
u
nits, and then
cond
u
ct the test operation.
U3-07
Check for transmission
b
et
w
een indoor and
o
u
tdoor
u
nits, and then
cond
u
ct the test operation.
U3-0
8
Cond
u
ct the refrigerant
a
u
to charge operation.
(The refrigerant a
u
to
charge operation has not
b
een cond
u
cted.)
U3-10
Caution
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
connectors, or parts may
b
e damaged.
