Si20-701_B Troubleshooting by Remote Controller
360
Remote Controller Display
U1
Applicable Models
CMSQ
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 significant phase difference is made between
phases
Supposed Causes
îš„ Power supply reverse phase
îš„ Power supply open phase
îš„ Defective outdoor unit PCB (A1P)
Troubleshooting
There
is an open
phase at the power
supply terminal section
(X1M) of the
outdoor
unit.
YES
NO
NO
Fix the open
phase. Requires
inspection of
field power
supply section.
Replace the
outdoor unit PCB
(A1P).
Operation is
normal if one
place of power supply
line phase is
replaced.
YES
Reverse phase
Counter
measure of the
problem is
completed by
phase
replacement.
Caution
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
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