Troubleshooting SiBE04-624
190 Service Diagnosis
2.34 Over Voltage Protection / Low Voltage Protection
Remote
Controller Display
U2
Outdoor Unit LED
Display
A5 55 ( - )
Method of
Malfunction
Detection
Detect an abnormal increase or drop of voltage by the detection circuit or DC voltage detection
circuit.
Malfunction
Decision
Conditions
When an overcurrent signal is sent to the microcomputer from the overcurrent detection
circuit, or the voltage detected by DC voltage detection circuit is less than 150 V and that
voltage continues for about 0.1 sec.
The machine shuts down if the fault conditions occurs 255 times
Fault counter is reset when the machine continuously runs for 60 min. without fault.
Supposed
Causes
Abnormal supply voltage, momentary power failure
Defective overcurrent detector or defective DC voltage detection circuit
Failure in PAM controlled parts
Troubleshooting
YES
Rectify the power supply.
Monitor in long term.
*Try to restart several
times.
Replace the outdoor unit
PCB.
(R3449)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check supply voltage
Disturbance factors
· Noise
· Distorted power supply
(Note on turning on the power supply)
Before turning on the power supply
again, power off status need to
continue at least 30 sec.
Repeat 2 or 3
times.
Is the
voltage within the specified
supply voltage?
NO
YES
NO
Does the
machine start up when turning on the
power supply again?
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