Troubleshooting SiUS04-904
Service Diagnosis 125
4.15 DC Voltage / Current Sensor Abnormality
Remote
Controller
Display
H8
Method of
Malfunction
Detection
Detecting abnormality of the DC sensor by the running frequency of compressor and by the input
current multiplied DC voltage and current.
Malfunction
Decision
Conditions
The compressor running frequency is below 52 Hz.
(The input current is also below 0.5 A.)
If this error repeats 4 times, the system is shut down.
The error counter is reset if this or any other error does not occur during the following 60-minute
compressor running time (total time).
Supposed
Causes
Outdoor unit PCB defective
Troubleshooting
Replace the outdoor unit PCB.
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
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