Daikin AT12BV1LS Pocket Manual page 138

Si10-417
5.3.6 Low-voltage Detection
Remote
Controller
Display
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Trouble
shooting
Service Diagnosis
U2
An abnormal voltage rise or drop is detected by checking
the detection circuit or DC voltage detection circuit.
An over-voltage signal is fed from the over-voltage
detection circuit to the microcomputer, or the voltage
being detected by the DC voltage detection circuit is
judged to be below 150 V for 0.1 second.
The system will be shut down if the error occurs 16
times.
Clearing condition: Continuous run for about 60
minutes (normal)
Supply voltage not as specified
Over-voltage detector or DC voltage detection circuit
defective
PAM control part(s) defective
Be sure to turn off power switch before connect or
Caution disconnect connector, or parts damage may be occurred.
Check the supply voltage.
Supply voltage as
specified?
YES
Turn on the
power again. System
restarted?
NO
Repeat a
couple of times.
A
(Precaution before turning on the power again)
Make sure the power has been off for
at least 30 seconds.
Disturbance factors
∗ Noise ∗ Power supply distortion
Troubleshooting
NO
Correct the power
supply.
YES
A
Replace the SPM.
(Replace the outdoor
unit PCB.)
Check for such factors
for a long term.
∗ Try to get restarted a
couple of times.
(R2854)
137