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SiUS30-1301
Troubleshooting by Indication on the Remote Controller
Service Diagnosis
215
3.3
8
Open Phase
Error Code
U1
Applicable
Models
RWEYQ72P, 84P
Method of Error
Detection
The phase of each phase are detected by reverse phase detection circuit and right phase or
reverse phase are judged.
Error Decision
Conditions
When a power supply is reverse phase, or T phase is open phase
Supposed
Causes
Power supply reverse phase
T phase open phase
Defective condensing unit PCB
Troubleshooting
Operation is
normal if one place of
po
w
er s
u
pply line phase
is replaced.
There is
an open phase
at the po
w
er s
u
pply (T
phase) terminal section
(X1M) of the
condensing
u
nit.
Fix the open phase. Re
qu
ires
inspection of field po
w
er s
u
pply
section.
Re
v
erse phase.
Co
u
ntermeas
u
re of the pro
b
lem is
completed
b
y phase replacement.
Replace the condensing
u
nit PCB
(A1P).
YES
YES
N
O
N
O
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.