Troubleshooting Si04-402A
94 Service Diagnosis
4.18 Sensor Abnormality around Compressor System
Remote
Controller
Display
H0
Method of
Malfunction
Detection
Detecting by the valve of direct current before the compressor starts up.
Malfunction
Decision
Conditions
When the value of direct current before the compressor starts up is not within 0.5~4.5V
(Sensor output is converted into voltage.)
When the value of direct voltage before the compressor starts up is under 50V.
Supposed
Causes
Faulty outdoor unit PCB
Broken harness or imperfect connection
Troubleshooting
Check the harness.
YES
Exchange the harness.
Replace the PCB.
Broken?
(R4001)
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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