SiAF341904E
Troubleshooting by Error Code
Part 6 Service Diagnosis
279
YES
YES
N
O
Make setting again, and then reset
the po
w
er s
u
pply.
Replace the o
u
tdoor
u
nit main
PCB (A1P).
N
O
Correct the m
u
lti com
b
ination of
o
u
tdoor
u
nits.
Replace the o
u
tdoor
u
nit main
PCB
(A1P)
.
Diagnosis Flo
w
chart-5
Diagnosis Flo
w
chart-4
Is the m
u
lti
com
b
ination of
o
u
tdoor
u
nits
proper?
N
O
W
as the
o
u
tdoor
u
nit main
PCB replaced
w
ith a
spare PCB?
Replace the o
u
tdoor
u
nit main
PCB (A1P).
YES
YES
YES
YES
N
O
Is the
proc
u
rement of the
spare PCB proper?
Proc
u
re a proper spare PCB.
Is the setting of the
spare PCB proper?
Error code
S
ub
code
UA-21
Error code
S
ub
code
UA-31
